The Portland Timbers are continuing to evaluate the severity of injuries to goalkeeper Jeff Attinella and defender Alvas Powell.

Powell had to leave last Saturday's home game against FC Dallas after suffering a concussion. Attinella had to leave the match as well after twice dislocating his shoulder in the game. Neither player participated in training Tuesday.

Timbers coach Giovanni Savarese said that Powell is currently going through the concussion protocol. Savarese said that the club would have a better idea Wednesday as to whether Powell would have to miss Saturday's game against Real Salt Lake.

"Alvas is right now on the concussion protocol," Savarese said. "We are evaluating him and it is a day-to-day thing."

Savarese said that Attinella's injury appears to be less severe than originally expected. He said that the club is evaluating whether Attinella could return in time for Saturday's game, but also indicated that the club would err on the side of caution.

"I don't think it will take too long for him to recover, but the doctors are evaluating exactly if he will be ready for this weekend or the following weekend," Savarese said. "We're trying to see how he's doing. He still has a little pain in the shoulder, but it's a lot better than we could have anticipated in the field because usually when you see that type of injury your concern is bigger."

Along with potentially missing Attinella and Powell Saturday, the Timbers are expected to be without defender Liam Ridgewell as well.

Ridgewell was issued a red card in stoppage time against FC Dallas last Saturday for appearing to kick Roland Lamah in the back while going up for a ball. Savarese did not say whether the club planned to appeal the call, but it would certainly be a surprise to see the call overturned since Ridgewell clearly made contact with Lamah.

"We'll review the card, the situation, we'll review if it should have been a red or not," Savarese said. "We have our own way of thinking in regards to the matter. I think there's been some discussions and in the end we'll make a final decision between today and tomorrow."

-- Jamie Goldberg | jgoldberg@oregonian.com

503-853-3761 | @jamiebgoldberg