[2] Mike, who was related to Alec Hall (Grimsby Town's Division One team), played in Ronald Humpston's Grimsby Town colts and juniors teams during the managerial reigns of Bill Shankly, Elemér Berkessy, and Billy Walsh; and represented the Lincolnshire County FA in the FA Youth Cup from 1954 to 1956.
Mike scored a hat-trick in the FA Youth Cup in a 7-2 win versus Nottinghamshire at the famous Appleby-Frodingham ground in Lincolnshire on 12 October 1956.
Mike, who was an apprentice motor fitter, was Grimsby Town Reserves' top goalscorer in the Midland League during the 1957-58 season with 21 goals.
The Sunderland Echo mentioned Mike in an article on 17 May 1958 entitled 'Allenby Chilton: Man behind Grimsby come-back' saying "in only one game Sinclair gave a hint that he might follow in the footsteps of Briggs and Glover as a great goal-scoring leader".
Mike was selected to make his 1st home league appearance of the season versus QPR, also in October, but was injured working in his trade so did not play.
He did not settle at Ards, during his military service in Northern Ireland, and scored on his final appearance for the club on 18 September 1961 in a Gold Cup defeat away to Glentoran.
These certificates, along with a pin badge, are presented to every single former Grimsby Town player who has played at least one professional game for the club since its birth in 1878.