Messi joined PSG on a free transfer after Barca were unable to re-sign the six-time Ballon d'Or winner due to its financial crisis.
It ended Messi's long-standing association with Barca, having made his senior debut for the LaLiga powerhouse in 2004-05.
Messi won 35 trophies at Camp Nou, scoring a record 672 goals across all competitions.
Now settling into life with PSG in the French capital, Messi said he is happy with his decision.
"I didn't make a mistake in going to PSG," Messi told said.
Since making the move to PSG, Messi has scored once – a goal in the club's 2-0 Champions League win over Manchester City.
The 34-year-old is yet to find the back of the net in Ligue 1, where PSG suffered a shock 2-0 loss at Rennes last week.
It snapped PSG's perfect start to the league season after eight consecutive wins, though Messi's men are still six points clear atop the table through nine rounds.