José Mourinho believes Wayne Rooney's desire to leave Manchester United is David Moyes's fault for suggesting the striker would be a second-choice player this season. Chelsea remain determined to sign Rooney despite having had two bids rejected and with the sides set to meet at Old Trafford on Monday night United are unlikely to appreciate the timing and nature of Mourinho's comments which will be seen as an attempt to undermine Moyes.

Rooney fell out badly with Sir Alex Ferguson last season and his relationship with the club appeared beyond repair after he was said to have been left "angry and confused" by Moyes hinting last month that he might have to accept a squad role behind Robin van Persie. However for all Rooney's unhappiness he is yet to hand in a transfer request.

When it was put to Mourinho that he will be given a hot reception at Old Trafford on Monday he reacted with bemusement. "They are against me?" Mourinho said. "But I didn't say [to Rooney] you will be a second-choice for me. And they are against me?

"We are trying to get a player that a manager told 'You will be a second option' for him. We are not going for Van Persie. They don't have to be against me. If I say Ramires is a second option for me and he plays when Lampard is tired or injured if someone comes here to get Ramires nobody is upset."

When Mourinho was asked if Moyes should shoulder the blame his reply was unequivocal: "Of course." In that moment questioning Moyes's managerial style it felt as if battle lines had been drawn though Mourinho then tried to distance himself from appearing too critical. "In every big team I am not criticising you have first options and second options and those second options must be very good players" he said. "Of course big teams must have second choices. Big players too. The point is if the players are happy to accept that situation."

Chelsea will wait until after Monday night's match before making a third approach but they are mindful of United's reluctance to sell the England forward. The champions are adamant Rooney is going nowhere especially not to a direct rival and although Chelsea hope United's resolve will be tested by a higher offer they are also making alternative arrangements.

They expect to complete the acrimonious £32m transfer of Willian from Anzhi Makhachkala this week subject to a work permit hearing for the Brazilian on Wednesday and are looking into the possibility of bringing his team-mate Samuel Eto'o to Stamford Bridge on a one-year deal as well.

Mourinho worked with the striker for a season at Internazionale. However Eto'o's agent who will be at Old Trafford on Monday night was believed to be in Milan on Sunday exploring the possibility of a better deal for the 32-year-old at Internazionale.