Guus Hiddink [ Images ] will definitely not be staying on as Chelsea [ Images ] manager next season and Jose Mourinho is not coming back, chairman Bruce Buck said on Monday.

"Guus Hiddink came here on a temporary basis two months ago and it is thanks to the Russian FA that he was able to come here; it is purely a temporary role," Buck was quoted as saying on the Premier League club's website.

"There has been a lot of speculation about him staying, especially as he has been doing a great job. That will not be the case."

Russia [ Images ] coach Hiddink was hired by Chelsea on a temporary basis in February after the sacking of Brazilian Luiz Felipe Scolari [ Images ]. The Dutchman is still committed to helping Russia qualify for next year's World Cup finals in South Africa [ Images ].

Since his arrival Chelsea have re-ignited their title challenge, reached the FA Cup semi-finals and can make the Champions League [ Images ] semis on Tuesday when they host Liverpool having won the first leg 3-1 at Anfield.

Speculation about who Chelsea would turn to next if Hiddink leaves have been rife, with former boss Mourinho a leading candidate despite being on the verge of taking Inter Milan [ Images ] to the Serie A title in his first season.

"My honest answer is that I don't think it is likely to happen," Buck said of the Portuguese who left the club in 2007 after winning the league title in 2005 and 2006.

"Jose was a great coach, he is a great guy but I think his time at Chelsea Football Club has passed."