Chicago Cubs reliever Pedro Strop will have to wait a little while longer to return from the disabled list as the right-hander suffered a right groin strain Thursday that will delay his recovery for another two weeks, the club announced.

Strop underwent meniscus surgery on his left knee in mid-August and was proceeding with a rehab assignment when he suffered the groin injury. The initial diagnosis after surgery ruled him out four-to-six weeks but Strop will now require the full six-week timeline for his recovery.

The club still expects him to pitch in late September.

Before injuring his knee on Aug. 10 against the Los Angeles Angels, Strop was in fine form in his fourth season with Chicago, pitching to a 2.89 ERA in 43 2.3 innings with a 0.893 WHIP.