Manchester United defenders Lisandro Martinez and Victor Lindelof have been ruled out of action for at least a month with muscle injuries.

Lindelof came off with a hamstring problem during Saturday's Premier League match against Brentford and was replaced by Argentinian centre-back Martinez. However, the club said on Tuesday night the latter has now sustained a calf strain in training and will miss United's next few games, starting with Thursday's league match against Chelsea at Stamford Bridge.

United have struggled with injuries during a largely underwhelming campaign. Martinez, fellow defenders Harry Maguire and Luke Shaw and summer signing Mason Mount are among the other players to spend chunks of the season on the sidelines.

Erik ten Hag will next speak to the media on Wednesday and give updates on the likes of Raphael Varane and Jonny Evans as the United boss faces a defensive crisis.

United have struggled with injuries during a largely underwhelming campaign., they have nine league fixtures left to play this season, beginning with Chelsea away on Thursday, as well as an Emirates FA Cup semi-final against Coventry City later this month.

Ten Hag's side are currently sixth in the Premier League and 11 points off Aston Villa in fourth, but have a game in hand. They face Chelsea on Thursday before welcoming Liverpool to Anfield on Sunday.

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"Manchester United centre-backs Victor Lindelof and Lisandro Martinez will be out of action for at least a month due to muscle injuries," Manchester United said in an update.

"Sweden captain Lindelof was withdrawn during the second half of last Saturday’s Premier League game against Brentford with a hamstring problem.

"Victor was replaced by Martinez after 69 minutes, as the Argentina international made his first appearance since early February. Unfortunately, Licha has now sustained a calf strain in training and is unavailable for the next few games."