Speaking for the first time since Mourinho left Stamford Bridge, Drogba said: "Our 1-1 home draw with Rosenborg has really put us under the cosh and the way to redress that is to go to Spain and impose ourselves on Valencia.
A performance and a result like that demands a certain kind of spirit, a particular mentality and total unity within the group.
"The majority of us within the squad used to dig deep and do it for the coach [Mourinho] in situations like this.
"It's this, specifically, that we have to forget and strive to now find another kind of motivation.
"That's something we need to discover in order to, just for example, make it as far as the last 16 of this competition which, at the start of the season I made my No1 target to win."