London, March 5 (IANS): Liverpool head coach Jürgen Klopp has confirmed that seasoned midfielder Lucas Leiva will be out for around 'five or six weeks' after suffering a quad injury during the penalty shootout in the Capital One Cup final on February 28.

The Brazilian international was carrying a knock when he stepped up to take Liverpool’s second kick at the Wembley stadium last Sunday and exacerbated the issue as he struck from 12 yards.

“Lucas is really unfortunate. It’s a little bit more serious,” Klopp told liverpoolfc.com on Friday.

“I’ve never heard about an injury you get like this, from a penalty, but it was only because he was a little bit injured before.

“He didn’t feel too much but after the shot it was done. (It’s a) quad -- I don’t know exactly but five or six weeks (out), not too good.”

There was positive news on defender Mamadou Sakho, though, who has returned to training after being forced off during the final against Manchester City due to a clash of heads with Emre Can.