Joey Barton played 90 minutes for Burnley's development squad on Tuesday after completing his move back to the club.
On Monday, the Clarets announced that the midfielder, who helped them to promotion to the Premier League last year, had rejoined until the end of the season after leaving Rangers in November.
Barton, 34, is facing a Football Association charge into alleged betting irregularities.
But he is now stepping up his fitness work and played a full game against Fleetwood at the Barnfield Training Centre.
A one-match suspension imposed by the Scottish Football Association was served during Monday's Premier League defeat at Manchester City.