Walker said in a message sent on behalf of everyone at AC Milan: "Obviously it is your birthday - the big 50. I just wanted to wish you personally, from me, a happy birthday. Obviously with being at Milan, wearing your shirt - I wear it with great pride after what you’ve done, especially for football in general, at every club that you’ve played at.
"The Milan family can definitely say they really appreciate you here. Your name speaks volumes to everyone in the footballing world. From me personally and everyone at Milan, I just want to wish you a happy 50th birthday and hope you have a good one."