Drogba (left) has called for more from Shevchenko

The Ivory Coast forward believes the struggling Ukraine international, 30, is too worried about trying to justify his �30m transfer fee.

Drogba was quoted in The Sun as saying: "On Shevchenko's side I don't really sense the desire to collaborate.

"I think that as a big signing he believes he is obliged to justify his transfer fee with goals at any cost."

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Drogba has 21 goals in all competitions this year, compared to just eight from Shevchenko, who arrived in the summer from AC Milan.

And Drogba says he is struggling to form the same sort of relationship that he did with Hernan Crespo last season.

"I love to share but when I give, I appreciate it when I get something back. That's what happened with Hernan Crespo. But let's say it is a little different this season.

"That is a real pity because everyone would have something to gain if we really worked together. I have tried to understand his position and get an explanation.

"We know we are not rivals because, unlike in the past years, there is room for two in attack this season.

"I understand it is a really difficult situation for him to handle. But you have to think of the team first."