diff --git a/src/core/coap/coap.cpp b/src/core/coap/coap.cpp
index 625f0905d..aa1855584 100644
--- a/src/core/coap/coap.cpp
+++ b/src/core/coap/coap.cpp
@@ -171,7 +171,7 @@ otError Coap::SendMessage(Message &               aMessage,
     if ((header.GetType() == OT_COAP_TYPE_ACKNOWLEDGMENT || header.GetType() == OT_COAP_TYPE_RESET) &&
         header.GetCode() != OT_COAP_CODE_EMPTY)
     {
-        mResponsesQueue.EnqueueResponse(aMessage, aMessageInfo);
+        mResponsesQueue.EnqueueResponse(header, aMessage, aMessageInfo);
     }
 
     // Set Message Id if it was not already set.
@@ -809,32 +809,14 @@ exit:
     return error;
 }
 
-otError ResponsesQueue::GetMatchedResponseCopy(const Message &         aRequest,
-                                               const Ip6::MessageInfo &aMessageInfo,
-                                               Message **              aResponse)
+void ResponsesQueue::EnqueueResponse(const Header &aHeader, Message &aMessage, const Ip6::MessageInfo &aMessageInfo)
 {
-    otError error = OT_ERROR_NONE;
-    Header  header;
-
-    SuccessOrExit(error = header.FromMessage(aRequest, 0));
-
-    error = GetMatchedResponseCopy(header, aMessageInfo, aResponse);
-
-exit:
-    return error;
-}
-
-void ResponsesQueue::EnqueueResponse(Message &aMessage, const Ip6::MessageInfo &aMessageInfo)
-{
-    Header                 header;
     Message *              copy;
     EnqueuedResponseHeader enqueuedResponseHeader(aMessageInfo);
     uint16_t               messageCount;
     uint16_t               bufferCount;
 
-    SuccessOrExit(header.FromMessage(aMessage, 0));
-
-    switch (GetMatchedResponseCopy(aMessage, aMessageInfo, &copy))
+    switch (GetMatchedResponseCopy(aHeader, aMessageInfo, &copy))
     {
     case OT_ERROR_NOT_FOUND:
         break;
diff --git a/src/core/coap/coap.hpp b/src/core/coap/coap.hpp
index f7522416a..a0b9a7f47 100644
--- a/src/core/coap/coap.hpp
+++ b/src/core/coap/coap.hpp
@@ -363,11 +363,12 @@ public:
      * response is not added.
      * The CoAP response is copied before it is added to the cache.
      *
+     * @param[in]  aHeader       A reference to a CoAP header.
      * @param[in]  aMessage      The CoAP response to add to the cache.
      * @param[in]  aMessageInfo  The message info corresponding to @p aMessage.
      *
      */
-    void EnqueueResponse(Message &aMessage, const Ip6::MessageInfo &aMessageInfo);
+    void EnqueueResponse(const Header &aHeader, Message &aMessage, const Ip6::MessageInfo &aMessageInfo);
 
     /**
      * Remove the oldest response from the cache.
@@ -395,21 +396,6 @@ public:
      */
     otError GetMatchedResponseCopy(const Header &aHeader, const Ip6::MessageInfo &aMessageInfo, Message **aResponse);
 
-    /**
-     * Get a copy of CoAP response from the cache that matches given Message ID and source endpoint.
-     *
-     * @param[in]  aRequest      The CoAP message containing Message ID.
-     * @param[in]  aMessageInfo  The message info containing source endpoint address and port.
-     * @param[out] aResponse     A pointer to a copy of a cached CoAP response matching given arguments.
-     *
-     * @retval OT_ERROR_NONE       Matching response found and successfully created a copy.
-     * @retval OT_ERROR_NO_BUFS    Matching response found but there is not sufficient buffer to create a copy.
-     * @retval OT_ERROR_NOT_FOUND  Matching response not found.
-     * @retval OT_ERROR_PARSE      Could not parse CoAP header in the request message.
-     *
-     */
-    otError GetMatchedResponseCopy(const Message &aRequest, const Ip6::MessageInfo &aMessageInfo, Message **aResponse);
-
     /**
      * Get a reference to the cached CoAP responses queue.
      *