Lillis progressed from the Gillingham junior ranks and made his league debut aged 18 in a Third Division match on 29 August 1987 against Southend United. His first goal for the club, scored on 14 November 1987, was Gillingham's first in a 2–1 FA Cup victory over Fulham.[3] After making a total of 29 league appearances scoring three goals Lillis was released by Gillingham in the spring of 1989 and, via a spell with FF Jaro in Sweden and a short period with Queens Park Rangers (where he played a few reserve team games)[4] his next matches in the Football League were for newcomers Maidstone United in the Fourth Division. He signed for the club, managed by his former Gillingham manager Keith Peacock, in the summer of 1989[4] and spent three seasons with the club appearing in 75 league games scoring 18 goals, which included a hat-trick on 10 March 1990 against Colchester United. During his time with Maidstone United in February 1991 Lillis had a short loan spell with Carlisle United, playing in four league matches scoring one goal.
On leaving Maidstone United, in June 1992 Lillis joined Sittingbourne.[5] The club were newly promoted to the Southern League and they won the 1992–93 Southern Division when he was with the club. In October 1993 Lillis returned to the Football League when he was signed by Third Division club Walsall.[6] He played in 24 league matches scoring six goals for the club in the 1993–94 season but after a single substitute appearance[7] at the start of the next season he left the club and was signed on a non-contract basis by Second Division club Cambridge United.[8] After scoring four league goals in 19 appearances for Cambridge, Lillis moved to non-league football: in March 1994 he was loaned to Dover Athletic[9] and, although briefly recalled by Cambridge United,[10] in April 1994 Lillis signed for former club Sittingbourne.[11] Thereafter he played with Ashford Town[12] of the Southern League, Kent League clubs Chatham Town[13] and twice with Lordswood,[14][15] before, in 1998 turning out for Palmerston of the Medway Sunday league.[16]
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