Kylian Mbappe has "no excuse" to leave Paris Saint-Germain following Lionel Messi's arrival, according to club president Nasser Al-Khelaifi.

Messi was unveiled at a press conference at the Parc des Princes on Wednesday while thousands of fans gathered outside the stadium to welcome the superstar forward.

The Argentina captain signed a two-year deal, with the option of a further 12 months, after Barcelona were unable follow through on the terms they agreed with the 34-year-old due to financial problems.

Mbappe has less than year remaining on his contract with the Ligue 1 club but PSG president Al-Khelaifi believes the France forward has no option but to stay and play alongside Messi and Neymar.

"Everyone knows the future of Kylian," said Al-Khelaifi. "He's a competitive player who wants to win trophies - he's said that himself.

"He wanted a competitive team, [with Messi] there is no excuse. He can't do anything else but stay."

Al-Khelaifi insists PSG are in no danger of breaching UEFA Financial Fair Play (FFP) regulations after luring Messi to the French capital.

Asked about FFP, he replied: "A very great question, thank you. We have checked and we knew we had the capacity to sign Leo.

"What Leo brings to the club is huge, that is what you media need to focus on, not the negative, the positive."