PSG boss Pochettino keeps an eye on his new star man.
“We need to analyse and we will decide later,” Pochettino told a news conference on Saturday.
“They will probably be in the squad,” he added, referring to Brazil striker Neymar, France’s Kylian Mbappe and Messi.
PSG said later that the squad would be announced on Sunday morning.
Messi has not played since winning the Copa America with Argentina against Brazil on July 11.
“He is very motivated. He’s a great professional who is adapting very fast to his new team mates and to a new context,” said Pochettino.
“He has the capacity to adapt to a new league.