UFC middleweight champion Chris Weidman will undergo knee surgery on Tuesday night. The issues knocked Weidman out of a planned meeting with Lyoto Machida.

Instead of facing Machida in May, Weidman will now defend his title in July at UFC 175 against the former UFC light heavyweight champion.

Weidman posted on Twitter that he will have “surgery (Tuesday) at 6:30 p.m. and can’t eat anything after 7 a.m. so gotta stuff up (Monday).”

The surgery will take place on both knees, as he will have his meniscus repaired.

Weidman (11-0) successfully defeated Anderson Silva for a second time last December, running his UFC mark to 7-0. Machida (21-4) is 2-0 since dropping down to 185 pounds.