Liverpool midfielder Lucas Leiva has vowed to fight back after being ruled out for the season with a knee injury.

Lucas was carried from the field on a stretcher after a clash with Chelsea's Juan Mata and his - and the club's - worst fears were confirmed by a scan.

The 24-year-old was inundated with messages of goodwill on Twitter and he responded in kind.

"Just to confirm that I will be out until the rest of season," he wrote.

"I am really sad with the news because I was enjoying [it] a lot on the pitch.

"I am sure I will come back stronger and I will achieve everything that I dream with the LFC shirt.

"I am sure I'll never walk alone."