The South American star was snapped at Melwood on Thursday morning, having flown back to England from international duty.
The midfielder, who handed a transfer request on August 11 to force a move to Barcelona this summer, took part in his first full training session with Liverpool this season.
Coutinho returned to action last week for Brazil, making two substitute appearances in Brazil’s World Cup qualifiers, though he is yet to play for Liverpool this season because of a reported back injury.
Coutinho was pictured sharing a light moment with his team mate Alberto Moreno before taking part in full session training with his other team mates.
With some minutes under his belt during qualifiers, it remains to be seen whether Coutinho will be in the squad for the trip to Manchester City this weekend.