Greek champions Olympiakos announced Sunday that striker Kostas Mitroglou has returned to the club on loan until June 2015 from Fulham.

Mitroglou, 26, initially joined Fulham in January on a four-and-a-half-year contract for a reported £12.5m (15.8m euros, $20.75m) transfer fee but injuries limited his impact at the English side.

"I am very happy to return to Olympiakos, which is my family. I want to thank the Olympiakos president (Vangelis Marinakis), the club's administration and coach Michel who showed how much they wanted me back. I also want to thank Fulham, who respected my wish to play at a higher level, the UEFA Champions League," Mitroglou said.

Mitroglou saw limited action at the recent World Cup for Greece but won five league titles and three Greek Cups during his previous spell at Olympiakos.

He was the top scorer in the Greek Super League in the first half of last season with 14 goals before moving to London.

Mitroglou began his professional career with Borussia Moenchengladbach in Germany before joining Olympiakos in 2007. He went on to make 148 appearances for the Greek heavyweights, scoring 62 goals.

Last season he became the first Greek player to score a Champions League hat-trick when he claimed all three goals in Olympiakos's 3-0 group-phase success away to Belgian side Anderlecht.

He has scored eight goals in 28 international appearances, notably netting three times as Greece overcame Romania in a two-legged FIFA World Cup qualifying play-off in November.

Olympiakos have been drawn alongside Atletico Madrid, Juventus and Malmo in Group A of this season's Champions League and will begin their campaign at home to Atletico on September 16.