Joel Matip (left) is wanted by Liverpool

Liverpool have put in an offer for Schalke defender Joel Matip, according to Sky sources.

Sky Sports News HQ reported in early January that the Reds were interested in a move for the German-born Cameroon international.

It appears Liverpool have taken their interest one step further by tabling a bid for Matip and Sky in Germany also reports that the player, who has scored three goals in the Bundesliga this season, has told his club he wants to leave.

Matip is out of contract at the end of the season but Schalke want him to sign a new deal.

The 6ft 4in centre-back would be a strong addition to Jurgen Klopp's defence, which has conceded 32 goals in 23 Premier League matches this season, the most of any club in the top 11.

Liverpool may face a battle to secure his services with the Press Association reporting three weeks ago that at least two French clubs were also in the running for the 24-year-old.