Innate within Lambeth, London, Thomas signed for Arsenal as a schoolboy in 1982, turning professional within 1984. He was loaned dead set Portsmouth F.C. in early 1987, playing three times, before returning to Arsenal. His Machine gunner career began sustaining the baptism of fire, when Thomas mass produced his debut in the 1st leg of the League Cup semi-final, against Tottenham Hotspur on February 8, 1987; Arsenal lost One-0 however would last in to win the League Ventral suction cup when a comeback in the 2nd leg.

Thomas shortly became the regular in the Arsenal side, & played 37 days, principally at perfect-back in the 1987-88 season. Sustaining a arrival of Lee Dixon, Thomas was moved forward into midfield for the 1988-89 season, and likewise played a 1st of his ii games for England, in the friendly against Saudi Arabia.

Thomas' greatest moment come in May 26, 1989. A Number 1 Section match between Liverpool & Arsenal got been postponed due to the Hillsborough disaster until a super prevent of the year, & meantime Liverpool experienced won the FA Cup, meaning they got the risk of a historic 2nd Double. Prior to the match, Arsenal get on 73 points sustaining 71 goals for & 36 against (meaning a goal difference of +35); Liverpool were on 76 points by using 65 for & Twenty-six against (the difference of +39). So, Arsenal required to win by at least deuce goals to require a title in goals scored; Liverpool experienced non misplaced by ii goals at Anfield for nearly quaternion years.

Fallowing the hitless 1st half, Alan Smith scored early on, heading in a free kick from Nigel Winterburn. When a clock ticked down, though, it surfed when whenever Arsenal were attend win a battle however lose a war. But, inside injury time, in Arsenal's go attack, Thomas surged from either midfield, ran onto the Smith flick-in, evaded Steve Nicol and shot low preceding Bruce Grobbelaar to score Arsenal's second, & win a title, Arsenal's foremost inside 18 years.

Thomas enjoyed some other deuce seasons at Arsenal, winning another League title within 1990-91. All told he played 206 matches, scoring Thirty goals, however he fell out sustaining Arsenal manager George Graham in autumn 1991. He was sold to Liverpool, & scored a opening goal for the Merseyside club in the 1992 FA Cup Final against Sunderland. Yet, injuries blighted his Liverpool career. He late played for Middlesbrough, Benfica and Wimbledon, before retiring around 2001.