Dec 14, 2018; Portland, OR, USA; Portland Trail Blazers forward Zach Collins (33) dunks over Toronto Raptors guard Danny Green (14) in the second half at Moda Center. Mandatory Credit: Jaime Valdez-USA TODAY Sports

Zach Collins will remain out of action indefinitely, after undergoing an ankle surgery on Wednesday.

Collins had surgery to repair a left medial malleolus stress fracture and there is no timetable for his return to action.

Collins has been sidelined since mid-August and had another surgery on September 1.