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Chad Marshall returned to training on Tuesday for the first time since suffering a concussion on May 4, though he will tread cautiously having been treated for concussions in the past.

The Crew captain was first treated for a concussion in 2007, forcing him to miss the final two months of the season.

Marshall has traditionally returned to action after a couple of weeks on the sideline, but head coach Robert Warzycha has already ruled the defender out for Saturday's clash with Real Salt Lake, lining up the July 8 meeting with the Montreal Impact as the more likely date of return.

"He needs to do some fitness," Warzycha told MLSsoccer.com. "We don't want to push him too much because he can get injured. Usually what happens is you're out two months and you try to go too fast, there's a muscle injury and you're out another two months."