Colorado Rapids midfielder Dillon Serna will undergo surgery after tearing the ACL and lateral meniscus in his right knee during the Lamar Hunt U.S. Open Cup match at FC Dallas on Wednesday night.

It is expected he will be sidelined for six to eight months.

“We are extremely disappointed for Dillon that this injury has come at a time when he and the club are doing so well,” said Paul Bravo, Technical Director and VP of Soccer Operations. “Now, it is important for us to fully support him throughout the process of getting back on the field. Everyone at the club wishes Dillon a speedy recovery.”

Serna has featured in 11 games this season, five starts, and has scored twice, both late winning goals. His long-range strike beat Sporting Kansas City on May 11 and, the following month, a similar goal secured safe passage for the Rapids in their U.S. Open Cup match against Colorado Springs Switchbacks FC.

In total, the Brighton-native has played in 81 MLS games, with seven career goals, since signing for the Rapids as a Homegrown Player in 2013. He has also represented the U.S. at the U17, U20 and U23 levels.