While the six-time Ballon d’Or winner Argentina could reform a lavish and menacing front three with Kylian Mbappe and Neymar, Guardiola is hopeful that Messi will be available to face the Spaniard.
“This type of player speaks for himself on the pitch,” Guardiola said of Messi, whom he managed at Barcelona.
“What he has done in his career is more than exceptional and I hope that tomorrow he can play for the good of the game.”
After more than 20 years of association with Barcelona, Messi left this summer after the club experienced financial difficulties.
Guardiola admitted that the move to PSG had surprised him: “It was a surprise to everyone but what happened happened. Everyone accepts it now.
“A long time ago you couldn’t imagine it, but it happened. In life itself, you never know what’s going on. What is important is that he will be happy in Paris.
Manchester City beat PSG 4-1 on aggregate in the Champions League semi-finals last season.
The Qatari club have grown considerably since then, however, with Messi signing alongside some of the best and brightest in European football including Gianluigi Donnarumma and Sergio Ramos.
Guardiola, whose side lead Group A after beating RB Leipzig 6-3 in the first round, believes Manchester City will face a tall order when they visit Paris.
“They are huge competitors. It’s a new game, it’s the group stage, it’s different. We will see.
“PSG have a very good team, more or less the same as last season, adding Messi and (Georginio) Wijnaldum and a few others.
“They are stronger this season, they have a bigger team. It will be more or less the same game as last season, very close.
PSG were held by Belgian side Club Brugge in their opening game of their Champions League campaign.