Pochettino undecided on Messi's debut ahead of Friday's clash against Brest.
Paris St-Germain is set to decide if Lionel Messi will make his much-anticipated debut in Friday's Ligue 1 game at Brest.
The six-time Ballon d'Or winner, 34,joined PSG on a free transfer last week after leaving Barcelona because of their financial difficulties.
He has yet to play a game since winning the Copa America with Argentina - but is in full training with PSG.
"We haven't decided the squad yet," boss Mauricio Pochettino said.
"We will assess whether Messi can be a part of it.
"Everything is positive. There is a good atmosphere in the squad and he has settled in well and quickly. There is a very good feeling."
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Pochettino played down rumours France forward Kylian Mbappe could join Real Madrid this summer.
"Mbappe is our player and I want him to be here this season," said Pochettino.
"He has another year left on his contract. Even if he doesn't renew it, he is still a PSG player and we are very pleased with him, and from what I can understand he is pleased with us.
"He is very calm and preparing well for tomorrow's game."