Chelsea midfielder Ramires is facing a lengthy spell on the sidelines with a medial knee ligament injury after being forced off in his side's 1-0 win over QPR, Andre Villas-Boas has confirmed.
The Blues' boss spoke to reporters after the game and suggested Brazilian midfielder Ramires could be facing a minimum of four weeks out after the FA Cup tie at Loftus Road.
"It looks like a medial knee ligament injury," Villas-Boas confirmed.
"It is not so bad in terms of the worst knee injuries but he'll have the MRI scan tomorrow and we'll know the full extent and I think hopefully he is going to avoid an operation."
Villas-Boas confirmed his midfielder would definitely miss the club's trip to Swansea on Tuesday.
"Ramires? I don't think he will play," he said. We have to know the extent of the ligament injury and eventually with the treatment and results we have been having medically, we could be looking at a four-week period.
"We have to look at the extent of the injury. Maybe more than that, but hopefully not."
Ramires sustained the injury in the final stages of Chelsea's win and Villas-Boas reflected positively on the performance of his side in the match.
"We looked dominant for the whole game but maybe first half a bit one paced, slow in possession, still creating danger, but maybe less incisiveness than in the second half," he said.
"In the second half we did a bit better and improved as a team and because of the amount of attack, we eventually got the penalty situation which repaid us with a 1-0 win.
"So I think it was a good solid display. QPR are always difficult on the counter, creating you problems mainly from our mistakes.
"After the goal, they were much more direct and objective but we held on to a good 1-0 and go through."
A cloud had been cast over the pre-match ritual as tensions between the two clubs over the John Terry and Anton Ferdinand issue forced the traditional handshake routine to be cancelled.
"I was informed of the decision 45 minutes before the game," Villas-Boas stated.
"I think it was a wise decision bearing in mind the expectancy that was aroused from the fact that a couple of events could happen in that handshake.
"I think the decision of both clubs backed up by the FA was sensible to avoid that expectancy and the possible crowd reaction from whatever would happen from that handshake.
"It was a question of avoiding troublesome situations and I think it was a good decision. Everything was clear and both teams got on with ther jobs."