Liam Rosenior gave a brutally honest assessment of Chelsea’s ‘unacceptable’ performance following their latest defeat.The Blues were beaten 3-0 away at Brighton on Tuesday night in a blow to their Champions League hopes.Rosenior labelled his side’s display at Brighton ‘unacceptable’ as Chelsea’s woes continuedAFPChelsea now find themselves seven points adrift of the top five with four matches remaining.Their opponents also leapfrogged them in the table, leaving Rosenior’s side in seventh place after five consecutive defeats.They have failed to score in any of those outings, making it their worst run of results since 1912.Meanwhile, the five sides immediately below all have a game in hand on Chelsea.Brentford, Bournemouth, Everton, Sunderland and Fulham can all climb above the Blues in the table before they next play in the league.Rosenior takes his side to Wembley Stadium for an FA Cup semi-final against Leeds United on Sunday.‘Unacceptable’ performanceThe Chelsea boss slammed the performance of his players at full-time on Tuesday.Following the match, Rosenior spoke exclusively to talkSPORT and said: “Unacceptable, unacceptable in every area. The complete opposite of anything I want to see on a football pitch.“I feel numb. I’m angry, frustrated. It has to turn around very, very quickly.”When asked how he can convince his players to turn their form around, Rosenior added: “At this moment, it’s not even about convincing.Chelsea have lost their last five Premier League matches without scoring a goalGetty“I apologise to the fans after the game for them to travel this way, for the fans who watched at home.“That’s unacceptable. I can’t dress it up any other way. To represent this football club with the history and traditions that it’s got and for us to go and put in a performance like that.“I can forgive mistakes of giving the ball away, I can forgive missing shots, but what I can’t forgive is losing 50/50 duels, ducking out of headers. It’s embarrassing.“I’m really, really devastated. Not even at the result, but at the manner in which we lost this game.”talkSPORT verdictFormer Chelsea defender Jason Cundy is fearing the worst ahead of this weekend’s FA Cup semi-final.The talkSPORT co-host shared his views on the performance on The Sports Bar on Tuesday night.Rosenior apologised to the Chelsea fans for his side’s ’embarrassing’ displayGettyCundy explained: “It was a gutless and spineless performance. I’m trying to use my words but I’m so angry and I’m so disgusted with that performance.“That is, first off, I don’t know what that was. That was absolutely turgid. Disgusting. And do you know what? It’s getting worse. It’s getting worse.“Brighton are a good side, they caught us at a good time, but that is unacceptable. That is unacceptable.“We’ve got Leeds at the weekend and I’m telling you now, we ain’t winning that game. We are not winning that game. We’re getting dumped out of the FA Cup.“I don’t know where the next victory is going to come from. I don’t know where the next shot on target is going to come from. Absolutely disgusted.“I think it’s the worst performance I’ve ever seen, and I’ve played in a few, from a Chelsea side.“I genuinely can’t think of a worse performance than that, I genuinely can’t. I cannot think of a worse, gutless, spineless performance. I just can’t think of a worse performance.”