To be precise, Messi has already passed the peak of his career as a footballer, now he is enjoying the final moments of his football career with PSG. Xavi interest in bringing Messi back to Barcelona is not as his partner on the touchline, but Xavi wants Messi back in the Barcelona squad. I think Messi will fulfill Xavi request to return to Barcelona after his contract with PSG expires. Maybe Messi can't play like he used to because he's old for a footballer standards, but Messi can help other players and increase the confidence of players to give the best for their club.
True, but I see messi is still very fit at his age (35 years) he can contribute to psg in this season even in the first game of this season he has scored two goals. Xavi will be very happy if he manages to bring Messi back to Barcelona next season when his contract expires at PSG. he is a legend of barcelona and i hope he can retire in barcelona during the time of his football career.