The former world number one has struggled to maintain dominance this season, losing his top ranking to Tiger Woods.
"I think he'll be fine," Supersport.com quotes Fowler as saying. "He's a great player and he's very talented. Golf is a game of confidence.
"When you get on a good roll and get things going, if he gets a few good finishes and gets momentum and confidence back on his side, he'll be fine."
McIlroy narrowly missed out on winning the Korea Open after finishing one shot off the lead.