Zlatan Ibrahimovic will be out of action for four weeks, Paris Saint-Germain president Nasser Al Khelaifi has announced.

The forward pulled up in the 68th minute of his side's Champions League quarterfinal first leg with Chelsea on Wednesday and was forced to be substituted, with tests later confirming a hamstring problem.

PSG has now confirmed that the Sweden international will miss the second leg against the Blues as he will likely be sidelined for a month, with scans expected to confirm the severity of the injury Friday.

"It's an MRI [scan] at this time," Nasser Al Khelaifi told RMC. "We will have the result within half an hour, an hour. But he will need at least four weeks of rest. He won't play the next game against Chelsea."

As well as missing Tuesday's return leg at Stamford Bridge, the 32-year-old will also be unavailable for the Coupe de la Ligue final against Olympique Lyonnais on April 19.

Lucas Moura, who replaced Ibrahimovic against Chelsea, has been given a vote of confidence by Al Khelaifi, who has backed the Brazilian to step up in the Swede's absence.

"I think Zlatan is very important for the team, but Lucas is ready," he said.