diff --git a/Source/Core/Core/HW/EXI/EXI_DeviceSlippi.cpp b/Source/Core/Core/HW/EXI/EXI_DeviceSlippi.cpp
index 862ecb8114a7..fb7ecf1c2a49 100644
--- a/Source/Core/Core/HW/EXI/EXI_DeviceSlippi.cpp
+++ b/Source/Core/Core/HW/EXI/EXI_DeviceSlippi.cpp
@@ -41,6 +41,7 @@ extern bool g_needInputForFrame;
 
 #ifdef LOCAL_TESTING
 bool isLocalConnected = false;
+int localChatMessageId = 0;
 #endif
 
 namespace ExpansionInterface
@@ -1884,6 +1885,26 @@ void CEXISlippi::prepareOnlineMatchState()
   u32 rngOffset = 0;
   std::string p1Name = "";
   std::string p2Name = "";
+  u8 chatMessageId = 0;
+	u8 sentChatMessageId = 0;
+
+#ifdef LOCAL_TESTING
+	chatMessageId = localChatMessageId;
+	localChatMessageId = 0;
+	// in CSS p1 is always current player and p2 is opponent
+	p1Name = "Player 1";
+	p2Name = "Player 2";
+#endif
+
+	// Set chat message if any
+	if (slippi_netplay)
+	{
+		chatMessageId = slippi_netplay->GetSlippiRemoteChatMessage();
+		sentChatMessageId = slippi_netplay->GetSlippiRemoteSentChatMessage();
+		// in CSS p1 is always current player and p2 is opponent
+		p1Name = userInfo.display_name;
+		p2Name = oppName;
+	}
 
   auto directMode = SlippiMatchmaking::OnlinePlayMode::DIRECT;
 
@@ -1969,6 +1990,10 @@ void CEXISlippi::prepareOnlineMatchState()
   // Add delay frames to output
   m_read_queue.push_back((u8)SConfig::GetInstance().m_slippiOnlineDelay);
 
+  // Add chat messages id
+	m_read_queue.push_back((u8)sentChatMessageId);
+	m_read_queue.push_back((u8)chatMessageId);
+
   // Add names to output
   p1Name = ConvertStringForGame(p1Name, MAX_NAME_LENGTH);
   m_read_queue.insert(m_read_queue.end(), p1Name.begin(), p1Name.end());
@@ -2073,6 +2098,28 @@ void CEXISlippi::prepareFileLoad(u8* payload)
   m_read_queue.insert(m_read_queue.end(), buf.begin(), buf.end());
 }
 
+void CEXISlippi::handleChatMessage(u8 *payload)
+{
+
+	int messageId = payload[0];
+	INFO_LOG(SLIPPI, "SLIPPI CHAT INPUT: 0x%x", messageId);
+
+#ifdef LOCAL_TESTING
+	localChatMessageId = 11;
+#endif
+
+	if (slippi_netplay)
+	{
+
+		auto userInfo = user->GetUserInfo();
+		auto packet = std::make_unique<sf::Packet>();
+		//		OSD::AddMessage("[Me]: "+ msg, OSD::Duration::VERY_LONG, OSD::Color::YELLOW);
+		slippi_netplay->remoteSentChatMessageId = messageId;
+		slippi_netplay->WriteChatMessageToPacket(*packet, messageId);
+		slippi_netplay->SendAsync(std::move(packet));
+	}
+}
+
 void CEXISlippi::logMessageFromGame(u8* payload)
 {
   if (payload[0] == 0)
@@ -2315,6 +2362,9 @@ void CEXISlippi::DMAWrite(u32 _uAddr, u32 _uSize)
     case CMD_LOG_MESSAGE:
       logMessageFromGame(&memPtr[bufLoc + 1]);
       break;
+    case CMD_SEND_CHAT_MESSAGE:
+			handleChatMessage(&memPtr[bufLoc + 1]);
+			break;
     case CMD_UPDATE:
       handleUpdateAppRequest();
       break;
diff --git a/Source/Core/Core/HW/EXI/EXI_DeviceSlippi.h b/Source/Core/Core/HW/EXI/EXI_DeviceSlippi.h
index 19782513fd8d..9a7840afad65 100644
--- a/Source/Core/Core/HW/EXI/EXI_DeviceSlippi.h
+++ b/Source/Core/Core/HW/EXI/EXI_DeviceSlippi.h
@@ -70,6 +70,7 @@ class CEXISlippi : public IEXIDevice
     CMD_UPDATE = 0xB8,
     CMD_GET_ONLINE_STATUS = 0xB9,
     CMD_CLEANUP_CONNECTION = 0xBA,
+    CMD_SEND_CHAT_MESSAGE = 0xBB,
     CMD_GET_NEW_SEED = 0xBC,
 
     // Misc
@@ -108,6 +109,7 @@ class CEXISlippi : public IEXIDevice
       {CMD_GET_MATCH_STATE, 0},
       {CMD_FIND_OPPONENT, 19},
       {CMD_SET_MATCH_SELECTIONS, 6},
+      {CMD_SEND_CHAT_MESSAGE, 2},
       {CMD_OPEN_LOGIN, 0},
       {CMD_LOGOUT, 0},
       {CMD_UPDATE, 0},
@@ -179,6 +181,7 @@ class CEXISlippi : public IEXIDevice
   void prepareIsFileReady();
 
   // misc stuff
+  void handleChatMessage(u8 *payload);
   void logMessageFromGame(u8* payload);
   void prepareFileLength(u8* payload);
   void prepareFileLoad(u8* payload);
diff --git a/Source/Core/Core/NetPlayProto.h b/Source/Core/Core/NetPlayProto.h
index b07b6a3f9f4a..9d83117c7178 100644
--- a/Source/Core/Core/NetPlayProto.h
+++ b/Source/Core/Core/NetPlayProto.h
@@ -135,6 +135,7 @@ enum
   NP_MSG_SLIPPI_PAD_ACK = 0x81,
   NP_MSG_SLIPPI_MATCH_SELECTIONS = 0x82,
   NP_MSG_SLIPPI_CONN_SELECTED = 0x83,
+  NP_MSG_SLIPPI_CHAT_MESSAGE = 0x84,
 
   NP_MSG_GOLF_REQUEST = 0x90,
   NP_MSG_GOLF_SWITCH = 0x91,
diff --git a/Source/Core/Core/Slippi/SlippiNetplay.cpp b/Source/Core/Core/Slippi/SlippiNetplay.cpp
index a068ef976a49..6dd8f5d2413c 100644
--- a/Source/Core/Core/Slippi/SlippiNetplay.cpp
+++ b/Source/Core/Core/Slippi/SlippiNetplay.cpp
@@ -271,6 +271,18 @@ unsigned int SlippiNetplayClient::OnData(sf::Packet& packet)
   }
   break;
 
+  case NetPlay::NP_MSG_SLIPPI_CHAT_MESSAGE:
+  {
+    auto playerSelection = ReadChatMessageFromPacket(packet);
+    auto messageId = playerSelection->messageId;
+
+    // set message id to netplay instance
+    remoteChatMessageId = messageId;
+    // Show chat message OSD
+    INFO_LOG(SLIPPI_ONLINE, "[Netplay] Received chat message from opponent %i", messageId);
+  }
+  break;
+
   case NetPlay::NP_MSG_SLIPPI_CONN_SELECTED:
   {
     // Currently this is unused but the intent is to support two-way simultaneous connection
@@ -295,6 +307,22 @@ void SlippiNetplayClient::writeToPacket(sf::Packet& packet, SlippiPlayerSelectio
   packet << s.rngOffset;
 }
 
+void SlippiNetplayClient::WriteChatMessageToPacket(sf::Packet& packet, int messageId)
+{
+  packet << static_cast<NetPlay::MessageId>(NetPlay::NP_MSG_SLIPPI_CHAT_MESSAGE);
+  packet << messageId;
+}
+
+std::unique_ptr<SlippiPlayerSelections>
+SlippiNetplayClient::ReadChatMessageFromPacket(sf::Packet& packet)
+{
+  auto s = std::make_unique<SlippiPlayerSelections>();
+
+  packet >> s->messageId;
+
+  return std::move(s);
+}
+
 std::unique_ptr<SlippiPlayerSelections>
 SlippiNetplayClient::readSelectionsFromPacket(sf::Packet& packet)
 {
@@ -627,6 +655,20 @@ void SlippiNetplayClient::SetMatchSelections(SlippiPlayerSelections& s)
   SendAsync(std::move(spac));
 }
 
+u8 SlippiNetplayClient::GetSlippiRemoteChatMessage()
+{
+  u8 copiedMessageId = remoteChatMessageId;
+  remoteChatMessageId = 0;  // Clear it out
+  return copiedMessageId;
+}
+
+u8 SlippiNetplayClient::GetSlippiRemoteSentChatMessage()
+{
+  u8 copiedMessageId = remoteSentChatMessageId;
+  remoteSentChatMessageId = 0;  // Clear it out
+  return copiedMessageId;
+}
+
 std::unique_ptr<SlippiRemotePadOutput> SlippiNetplayClient::GetSlippiRemotePad(int32_t curFrame)
 {
   std::lock_guard<std::mutex> lk(pad_mutex);  // TODO: Is this the correct lock?
diff --git a/Source/Core/Core/Slippi/SlippiNetplay.h b/Source/Core/Core/Slippi/SlippiNetplay.h
index fa5aaf9a8748..225996d7066d 100644
--- a/Source/Core/Core/Slippi/SlippiNetplay.h
+++ b/Source/Core/Core/Slippi/SlippiNetplay.h
@@ -48,6 +48,8 @@ class SlippiPlayerSelections
 
   u32 rngOffset = 0;
 
+  int messageId;
+
   void Merge(SlippiPlayerSelections& s)
   {
     this->rngOffset = s.rngOffset;
@@ -123,9 +125,17 @@ class SlippiNetplayClient
   std::unique_ptr<SlippiRemotePadOutput> GetSlippiRemotePad(int32_t curFrame);
   SlippiMatchInfo* GetMatchInfo();
   u64 GetSlippiPing();
-  int32_t GetSlippiLatestRemoteFrame();
+  s32 GetSlippiLatestRemoteFrame();
+  u8 GetSlippiRemoteChatMessage();
+	u8 GetSlippiRemoteSentChatMessage();
   s32 CalcTimeOffsetUs();
 
+  void WriteChatMessageToPacket(sf::Packet &packet, int messageId);
+	std::unique_ptr<SlippiPlayerSelections> ReadChatMessageFromPacket(sf::Packet &packet);
+
+	u8 remoteChatMessageId = 0;     // most recent chat message id from opponent
+	u8 remoteSentChatMessageId = 0; // most recent chat message id that current player sent
+
 protected:
   struct
   {