Rory McIlroy

Rory McIlroy expects concentrating on the BMW PGA Championship will be difficult after splitting with tennis player Caroline Wozniacki.

The Northern Irishman announced the pair's engagement had been broken off on Wednesday ahead of the blue ribbon event of the European Tour at Wentworth

And the shock announcement has cast a shadow over McIlroy's chances this week and the two-time major winner admits his mind will be elsewhere.

"I am not going to lie it's going to be very difficult," the 25 year old said in his pre-tournament press conference. "At least when I get inside the ropes I can just concentrate on the other job in hand. It's obviously going to be difficult.

"I didn't think there was any reason to [pull out]," he added. "There is no good time to end a relationship.

"I made a commitment to be here. It's the European Tour's flagship event, I am very proud to be part of the European Tour and it's been very good to me over the last number of years.

"I thought it was my duty to come back and play in this event and one I gave my word I was never going to go back on it.

"I just want to get my head into golf this week and concentrate on the tournament and try and do well.

"I've been playing well, my form has been good and I just want to dive straight into it and try and keep myself busy and try and have a good week on the course."

McIlroy and Wozniacki, the world No.14, announced their engagement on New Year's Eve after two years together but came to an "mutual and amicable" decision after sending out wedding invitations at the weekend.

Wozniacki must now turn her attention to preparing for the French Open at Roland Garros which starts on 25 May, while McIlroy begins his campaign at Wentworth on Thursday ahead of a run of tournaments which includes the US Open and the The Open Championship.

"Obviously it's quite a difficult time for Caroline and myself," he explained. "It was mutual and amicable and we both thought it was for the best and time to move on and I think I've said all that needs to be said. "