Chelsea are interested in signing on-loan Nuremberg striker Stefanos Tzimas, reports Sky Germany's Patrick Berger. The Blues are said to be "monitoring the situation" of the 18-year-old, who is on loan at the 2. Bundesliga side from PAOK Saloniki. He has scored seven goals in 13 league matches so far this season, and it is reported that he is also on the shortlists of Aston Villa and Newcastle.