In-demand Schalke midfielder Leon Goretzka says he will decide his future in January.

The Germany international, 22, is one of Europe's most wanted stars, with the likes of Manchester United, Juventus, Barcelona, Bayern and Arsenal all chasing his signature.

Goretzka, who has 12 caps and six goals for his country, is out of contract at the end of the season and can negotiate with clubs from January 1.

Schalke have prepared their biggest-ever contract to persuade the 6ft 2in midfielder to stay put and turn down Europe's big hitters.