The England international made his return to competitive action in Liverpool’s 3-0 win against Exeter City in January after almost 18 months sidelined with a knee injury.
Flanagan started Liverpool’s League Cup semi-final second leg against Stoke City before the right-back was replaced ahead of the penalty shootout.
The 23-year-old has struggled to break into Jurgen Klopp’s side since the semi-final clash in late January as Nathaniel Clyne and Alberto Moreno continue to occupy the full-back spots.
However, the Liverpool-born defender has been working hard on his fitness after he posted a snap following a session on Saturday morning.
Flanagan wrote: “Good morning session with @Jonnynaylorfitness 💪”
Liverpool are hoping to win the League Cup for a record ninth time at Wembley on Sunday afternoon.
The Reds were 4-1 winners against Sunday’s opponents Manchester City in the Premier League earlier this season.
MORE: Latest Man Utd news
MORE: Latest Arsenal news
MORE: The latest football news