United States international Patrick Agyemang will miss his home World Cup after suffering a serious Achilles tendon injury.

Agyemang was visibly emotional when he was stretchered off, with his right leg strapped, after landing awkwardly in Derby’s 2-0 victory over Stoke in the second-tier English Championship on Monday.

Derby confirmed Tuesday that the striker would miss soccer’s biggest tournament, which is being held in the U.S., Canada and Mexico in June and July.

“As a result of this injury, Patrick will unfortunately miss this summer’s FIFA World Cup,” Derby said in a statement. “At this stage it would be wrong to put a timeline on his recovery.”

The club added that Agyemang would undergo more tests later Tuesday and “further updates will be communicated in due course.”

Agyemang, 25, has helped Derby into contention for promotion to the Premier League thanks to a team-leading 10 goals since arriving last summer from Charlotte FC in MLS.

During the recent international break, he came off the bench for the United States and scored in a loss against Belgium and also got some minutes against Portugal.