The Northern Irishman suggests that he needs to rediscover his best driving form in order to win Major titles again.
McIlroy: "Haven't Driven The Ball Like Myself Since 2019"
However, the Northern Irishman finished T49 at Kiawah Island and five over par for the weekend, meaning he hasn't won a Major since his 2014 victory at the PGA Championship.
"Probably haven't driven the ball like myself since 2019, so I need to figure it out," McIlroy said.
"I just need to figure out a driver, I just haven't driven the ball as well as I know that I can for a long time, and that's the foundation of my game.
"Once I'm driving it well, everything becomes so much easier.
"I just haven't driven the ball like myself for a while.
When asked about whether that involved figuring out the swing or the equipment, he responded that it was a combination of the two.
"I think a little bit of both.
"It was a good test this week to see where I was, and I still have a way to go."
At the 2021 PGA Championship, McIlroy ranked 47th in strokes gained off-the-tee, with +0.05.
When compared to previous years though, the four-time Major winner is clearly falling short.
Throughout the PGA Tour in 2019, his strokes gained off-the-tee averaged +1.25, while it dropped to +0.85 in 2020 and then +0.82 for this year.
For comparison, the year of his last Major victory in 2014 also equalled his best season off-the-tee, where he averaged +1.52 shots gained.