Mourinho has won two Premiership titles, an FA Cup and two League Cups during his three-year reign at Stamford Bridge, but even that impressive haul is not enough to totally satisfy billionaire owner Roman Abramovich.

The Champions League remains the holy grail for the Blues' hierarchy and Kenyon admitted success in Europe's elite competition was essential to their plans to become the world's biggest club.

"I think it (the European Cup) is one of the hardest trophies to pick up and to fulfil our ambitions as a world club you have to win the Champions League," Kenyon told The Times.

"It doesn't all rest on that this season, that's not what it's about, but what we've said is you have to win trophies on a regular basis.

"You have to win the Premier League and Champions League more than once to reach those heights of being truly recognised as a world club and we're well equipped."

Andriy Shevchenko and Michael Ballack were signed last year to aid Chelsea's attempt to conquer Europe, but neither player lived up to their illustrious reputation.

Shevchenko has been linked with a move back to AC Milan, while Ballack has attracted interest from Real Madrid.

But Kenyon insists they will stay because the best is still to come from both. "On the Andriy and Michael situation, we signed them for four years and we've definitely got the best to come from those two players, which is great news," he said.

After a tumultuous campaign that was scarred by Mourinho's clashes with Abramovich over transfer policy, Kenyon is confident peace has broken out in the corridors of power.

He added: "I think it's critically important Jose's still here and I think it comes off a season when we got to a stage where nobody thought that Jose would be here apart from the people inside the club."