Rory McIlroy admitted his swing has "regressed" after he wrapped up his PGA Championship with a level-par 70 that left him two-under for the tournament.

The Holywood man dropped out of contention after yesterday's 71.

It's four years since he won the last of his four major titles in the 2014 - the US PGA at Valhalla - and the 29-year-old said he may take time out to analyse where his game is at.

"There's a lot of room for improvement," he told RTÉ Sport.

"My swing hasn't been where I want it to be. It was pretty good at the start of the year, I had a couple of months to work on it, but it's sort of regressed as the season has gone on.

"You start to play tournaments, you start to fall back into some of the habits you don't want to fall back into. Inconsistency with the swing has been the big area. If you look at my statistics, especially with my approach play with my irons, and even my driving, it's been okay."

McIlroy revealed he's actually scaled back on his gym work and is considering skipping the first of the four FedExCup play-off events to instead focus on the Ryder Cup, which takes place at the end of September.

"I haven't seen the inside of a gym in about three months - and I've picked up three or four miles per hour in clubhead speed," he added.

"I don't really understand that! I feel like I've put the work in. It's not like I've been sitting on my ass not doing anything. It's one of those things. I've given myself chances. I just haven't quite played the golf I've need to whenever it's been called upon.

"I think the best thing for me to do right now is take a couple of days off, reflect on what I need to do going forward. I'll do some practise this week and see if I feel ready to go there and play five out of six weeks or whatever it is leading up tot the Ryder Cup."