US Open 2014: Rory McIlroy's phone to stay silent at Pinehurst

Rory McIlroy says his mobile phone will be switched off this week as he tries to win a second US Open title at Pinehurst.

The 2011 champion has had to deal with plenty of publicity since the end of his engagement to former tennis world number one Caroline Wozniacki.

"Sometimes you become dependent on all this new technology so it's nice to go back a bit," said McIlroy, 25.

"I've just stuck my head right into golf and got on with it."

He added: "I've got back to what I do best, which is being out there practising, playing golf and getting ready for the biggest tournaments in the world."

McIlroy's focused approach helped him win the BMW PGA title at Wentworth three weeks ago.

He won the European Tour's flagship event four days after announcing his split with Denmark's Wozniacki.

The Northern Irishman, who finished seven shots behind winner Hideki Matsuyama a week later at the Memorial Tournament in Ohio, says that he will go into this year's second major full of confidence.

He said: "I am really happy where my game is at, coming off a nice win at Wentworth a few weeks ago and a decent performance at Memorial."

The world number six reported the knee injury which had caused him some trouble in Ohio is "now fine".

"It is giving me no difficulty at all. I just needed to rest it a bit," he said.

McIlroy described the course at Pinehurst as "fantastic", but also warned it would be testing.

He said: "The fairways are a little bit more generous. There's no rough but if you hit it into the native areas then anything could happen.

"It's going to be the first US Open for several years which is going to play firm.

"It is going to be a real tricky test and a lot of patience is going to be required this week."

McIlroy acknowledged that he may have to curb his attacking instincts given the number of run-off areas around the Pinehurst greens.

He said: "Par is a good score out here and if you can grind out pars you are not going to lose any ground to the field."