Minnesota United winger Ethan Finlay will miss the remainder of the season with a torn ACL, the club confirmed on Tuesday.
Finlay, 27, fell to the turf while battling for the ball with Seattle's Alex Roldan in the 36th minute of Sunday's 3-1 loss and immediately clutched his right knee.
He received treatment on the touchline and returned to play the remainder of the half before being replaced by Sam Nicholson at the break.
Finlay, who had started all seven of Minnesota's games, is the second of the Loons' high-profile attackers to be lost for the season to an ACL injury, after Kevin Molino suffered the setback in the 2-1 win at Orlando City on March 10.
The former Creighton standout joined Minnesota last August in a trade with Columbus Crew SC that saw the Loons part with $425,000 in allocation money.
He made a name for himself in five-plus years in Columbus, where he was named to the MLS All-Star team and the league's Best XI in 2015 en route to the club's run to the MLS Cup final.
Finlay made his U.S. national team debut in January 2016, and has appeared in three games for his country.