The New Orleans Saints will be without their top two wide receivers for Thursday night’s game against the Denver Broncos and former coach Sean Payton.

Rashid Shaheed will undergo knee surgery on Thursday in Los Angeles to repair his meniscus, while Chris Olave will miss the game due to a concussion he suffered last Sunday, Saints coach Dennis Allen said Wednesday.

Shaheed’s surgery Thursday is expected to determine whether he will be sidelined multiple weeks or for the rest of the season, a source told ESPN’s Adam Schefter.

Allen also said that tight end Taysom Hill is doubtful for the game. He has missed the Saints’ past two games with fractured ribs.

Shaheed leads the Saints this season with 349 receiving yards and three touchdown receptions while Olave leads the team with 23 receptions and is second on the team with 280 receiving yards.