Supporters who’d like to leave a message for the great man are encouraged to do so from now up until the end of the month.
We'd love to hear your favourite Sir Alex memories or anecdotes; maybe you were lucky enough to meet him, or a specific match, trophy or moment lingers in your memory and is important to you. If so, share them alongside your birthday message.
We will be selecting the best messages we see to include in a special birthday book to be presented to Sir Alex in the new year, so he may well get to read your message personally!