Chicago Fire midfielder Patrick Nyarko tore his ACL during the team's match against D.C. United on Oct. 18, the team announced on Wednesday.
Nyarko, 28, also sprained his MCL and is expected to need six to eight months to recover after he undergoes surgery.
He had one goal and three assists in 17 appearances with the Fire this season, and he is currently tied for fourth-place in franchise history with 35 assists. He has spent his entire career with the Fire since being the No. 7 pick in the 2008 MLS SuperDraft.
“Knowing the work he put in to get back and help us this season, we feel awful for Patrick,” said Chicago Fire Head Coach and Director of Soccer Frank Yallop. “We saw his return to form over the past few weeks and fully support him in his recovery efforts.”
The Fire is 5-18-10 on the season and in ninth place in the Eastern Conference.