diff --git a/features/netsocket/InternetSocket.cpp b/features/netsocket/InternetSocket.cpp
index a0707574986..57d5a3c738e 100644
--- a/features/netsocket/InternetSocket.cpp
+++ b/features/netsocket/InternetSocket.cpp
@@ -205,11 +205,6 @@ void InternetSocket::sigio(Callback<void()> callback)
     core_util_critical_section_exit();
 }
 
-void InternetSocket::attach(Callback<void()> callback)
-{
-    sigio(callback);
-}
-
 nsapi_error_t InternetSocket::getpeername(SocketAddress *address)
 {
     if (!_socket) {
diff --git a/features/netsocket/InternetSocket.h b/features/netsocket/InternetSocket.h
index b347c3e6e52..4ebe465e4c3 100644
--- a/features/netsocket/InternetSocket.h
+++ b/features/netsocket/InternetSocket.h
@@ -124,33 +124,6 @@ class InternetSocket : public Socket {
      */
     nsapi_error_t getpeername(SocketAddress *address) override;
 
-    /** Register a callback on state change of the socket.
-     *
-     *  @see Socket::sigio
-     *  @deprecated
-     *      The behavior of Socket::attach differs from other attach functions in
-     *      Mbed OS and has been known to cause confusion. Replaced by Socket::sigio.
-     */
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "The behavior of Socket::attach differs from other attach functions in "
-                          "Mbed OS and has been known to cause confusion. Replaced by Socket::sigio.")
-    void attach(mbed::Callback<void()> func);
-
-    /** Register a callback on state change of the socket.
-     *
-     *  @see Socket::sigio
-     *  @deprecated
-     *      The attach function does not support cv-qualifiers. Replaced by
-     *      attach(callback(obj, method)).
-     */
-    template <typename T, typename M>
-    MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                          "The attach function does not support cv-qualifiers. Replaced by "
-                          "attach(callback(obj, method)).")
-    void attach(T *obj, M method)
-    {
-        attach(mbed::callback(obj, method));
-    }
 
 #if !defined(DOXYGEN_ONLY)
 
diff --git a/features/netsocket/TCPSocket.h b/features/netsocket/TCPSocket.h
index 3bbed020bf0..7749f671e6b 100644
--- a/features/netsocket/TCPSocket.h
+++ b/features/netsocket/TCPSocket.h
@@ -37,25 +37,6 @@ class TCPSocket : public InternetSocket {
      */
     TCPSocket();
 
-    /** Create a socket on a network interface
-     *
-     *  Creates and opens a socket on the network stack of the given
-     *  network interface.
-     *
-     *  @param stack    Network stack as target for socket
-     *
-     *  @deprecated since mbed-os-5.11
-     */
-    template <typename S>
-    MBED_DEPRECATED_SINCE("mbed-os-5.11",
-                          "The TCPSocket(S *stack) constructor is deprecated."
-                          "It discards the open() call return value."
-                          "Use another constructor and call open() explicitly, instead.")
-    TCPSocket(S *stack) : TCPSocket()
-    {
-        open(stack);
-    }
-
     /** Override multicast functions to return error for TCP
      *
      */
diff --git a/features/netsocket/UDPSocket.h b/features/netsocket/UDPSocket.h
index 9fe5f67b88d..70d45994b5a 100644
--- a/features/netsocket/UDPSocket.h
+++ b/features/netsocket/UDPSocket.h
@@ -38,23 +38,6 @@ class UDPSocket : public InternetDatagramSocket {
      */
     UDPSocket();
 
-    /** Create and open a socket on the network stack of the given
-     *  network interface.
-     *
-     *  @tparam S    Type of the Network stack.
-     *  @param stack Network stack as target for socket.
-     *  @deprecated since mbed-os-5.11
-     */
-    template <typename S>
-    MBED_DEPRECATED_SINCE("mbed-os-5.11",
-                          "The UDPSocket(S *stack) constructor is deprecated"
-                          "It discards the open() call return value."
-                          "Use another constructor and call open() explicitly, instead.")
-    UDPSocket(S *stack) : UDPSocket()
-    {
-        open(stack);
-    }
-
 #if !defined(DOXYGEN_ONLY)
 
 protected: