diff --git a/quic/core/quic_connection.cc b/quic/core/quic_connection.cc
index daf5031..31a5eb2 100644
--- a/quic/core/quic_connection.cc
+++ b/quic/core/quic_connection.cc
@@ -3941,6 +3941,9 @@
     buffered_packets_.emplace_back(buffer, length,
                                    coalesced_packet_.self_address(),
                                    coalesced_packet_.peer_address());
+    if (debug_visitor_ != nullptr) {
+      debug_visitor_->OnCoalescedPacketSent(coalesced_packet_, length);
+    }
     return true;
   }
 
@@ -3961,6 +3964,9 @@
                                      coalesced_packet_.peer_address());
     }
   }
+  if (debug_visitor_ != nullptr) {
+    debug_visitor_->OnCoalescedPacketSent(coalesced_packet_, length);
+  }
   // Account for added padding.
   if (length > coalesced_packet_.length()) {
     size_t padding_size = length - coalesced_packet_.length();
diff --git a/quic/core/quic_connection.h b/quic/core/quic_connection.h
index f35aa05..e92c876 100644
--- a/quic/core/quic_connection.h
+++ b/quic/core/quic_connection.h
@@ -194,6 +194,11 @@
                             TransmissionType /*transmission_type*/,
                             QuicTime /*sent_time*/) {}
 
+  // Called when a coalesced packet has been sent.
+  virtual void OnCoalescedPacketSent(
+      const QuicCoalescedPacket& /*coalesced_packet*/,
+      size_t /*length*/) {}
+
   // Called when a PING frame has been sent.
   virtual void OnPingSent() {}
 
diff --git a/quic/core/quic_connection_test.cc b/quic/core/quic_connection_test.cc
index cb2583e..98c2d57 100644
--- a/quic/core/quic_connection_test.cc
+++ b/quic/core/quic_connection_test.cc
@@ -9902,6 +9902,10 @@
   if (!connection_.version().CanSendCoalescedPackets()) {
     return;
   }
+  MockQuicConnectionDebugVisitor debug_visitor;
+  connection_.set_debug_visitor(&debug_visitor);
+  EXPECT_CALL(debug_visitor, OnPacketSent(_, _, _)).Times(3);
+  EXPECT_CALL(debug_visitor, OnCoalescedPacketSent(_, _)).Times(1);
   {
     QuicConnection::ScopedPacketFlusher flusher(&connection_);
     use_tagging_decrypter();