File Photo: the PSG striker has still not revealed where he will be playing next season with his contract about to expire. AFP
Mbappe is expected to reveal in the coming days whether he will join Real Madrid or accept a lucrative offer to stay at PSG, with an announcement potentially being made in the hours after the French champions play their final game of the Ligue 1 season at home to Metz on Saturday.
"I don't know what his decision is. I think it's a personal matter for Kylian and for the club," Pochettino said at a press conference ahead of the Metz match.
"There are lots of rumours going around but the player is the one who will have to talk about this.
"If I knew what his decision was I wouldn't be the one to talk about it."
Mbappe, who joined PSG from Monaco in 2017, last week won the Ligue 1 Player of the Year prize and comes into the final weekend of the season as the division's top scorer with 25 goals.
Rumours are swirling in France and in Spain about when he will confirm where his next contract will be.
"Mbappe, end of the suspense on Sunday," claimed the headline in French sports daily L'Equipe on Friday.
Pochettino said he hoped the 23-year-old would remain at PSG even if uncertainty surrounds the coach's own future despite the Argentine and his staff having a year left on their own deals.
"I hope Kylian is still here for many years to come but I also can't lie. I don't know what is going to happen," he said.
"We have a year left on our contracts so we will potentially be here next season. I just hope tomorrow (Saturday) we can enjoy celebrating the club's 10th league title."
One player who is definitely expected to move on is Angel di Maria, with the 34-year-old Argentine winger's own contract expiring and PSG understood to be happy for him to leave.
PSG have cantered to the Ligue 1 title, equalling Saint-Etienne's French record for most league championships, but their season has been soured by defeat against Real Madrid in the Champions League last 16 in early March.
The Parisians were 1-0 up away to Madrid an hour into the second leg thanks to a Mbappe goal, and led 2-0 on aggregate, only to implode and go out to a Karim Benzema hat-trick.
"I hope the best is still to come. I think everyone at Paris Saint-Germain wants to win the Champions League. That has become an obsession for this club and I hope we can win it," Pochettino added.
"That spell in the second half in Madrid saw us not get the result we wanted and created lots of questions and emotions that we have not been able to control in recent months.
"Despite that the players deserve to be congratulated because they have shown the ability to lift themselves and finish the season."
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