Arthur has thanked Jurgen Klopp and Liverpool for the support they showed him at a "difficult time" as the Brazilian struggled for form and fitness during his season-long loan spell at Anfield.
The Brazilian joined the Reds from Juventus on loan last summer as Klopp eyed up a late midfield addition following injuries to Thiago, Fabinho and Jordan Henderson. However, Arthur would go on to make just one appearance for the Reds, which came in the 4-1 defeat at Napoli in the Champions League.
He was forced to have surgery on a pulled quad muscle last October which ruled him out for the vast majority of the season. Arthur did return to the matchday squad for the trip to Bournemouth in March, but failed to get any minutes on the pitch.
