The Portland Timbers will likely be missing three key starters Friday when they host the New York Red Bulls in a big home match.

Captain Liam Ridgewell (aggravated quad), forward Fanendo Adi (hamstring injury) and goalkeeper Jake Gleeson (hamstring injury) have not been in training this week and are unlikely to play in the game.

"They haven't been in training this week to date, so they are looking unlikely for the weekend," Timbers coach Caleb Porter said.

Ridgewell, who missed eight-straight games after injuring and re-injuring his quad, returned to the field for a match against the LA Galaxy on Aug. 6, but had to leave the game in the 89th minute after aggravating his quad.

According to Porter, Ridgewell is dealing with an issue around the scar tissue in his quad. He missed last Saturday's game against Toronto FC and Porter said he expects Ridgewell to be out for at least the next two games, which are Friday against New York and next Wednesday against Colorado.

"Best case scenario was always going to be two to three weeks," Porter said "It's looking still like that. It could be four. It depends on how he responds, but he will definitely be out this week and next week I think."

Adi injured his hamstring in the game against LA on Aug. 6, while Gleeson had to leave the match against Toronto Saturday after suffering a hamstring injury of his own. Porter did not say when he expects Adi and Gleeson to be ready to return to the field.

Timbers left back Marco Farfan, who has been dealing with an ankle injury, is also out for Friday's game, but is expected to return to training next week.

-- Jamie Goldberg | jgoldberg@oregonian.com

503-853-3761 | @jamiebgoldberg