Manchester United's Alexis Sanchez ruled out for up to six weeks

Manchester United'sAlexis Sanchezis set to be out for up to six weeks after suffering a knee injury, manager Ole Gunnar Solskjaer confirmed on Tuesday.

"It was a bad knee injury so it's four weeks, or six weeks. Hopefully, he'll recover quickly," Solskjaer said at a press conference in Paris on the eve of United's Champions League last-16 second leg against Paris Saint-Germain.

The Premier League club have a mountain to climb against the French side after losing 2-0 in the first leg at Old Trafford last month.

Alexis Sanchez has yet to hit top form at Manchester United. /CGTN

Sanchez came off early in the second half of United's 3-2 win over Southampton at the weekend, and now joins a host of players in the treatment room.

Anthony Martial, Jesse Lingard, Juan Mata and Ander Herrera are among the players already sidelined, while Paul Pogba is suspended here after being sent off in the first leg.

As a result, five recent academy graduates were included in the traveling squad of 20.