User blog comment:Arbington/What Garrus in ME3 Means.../@comment-1221773-20110410163547

Yeah, it's very likely any ME2 squadmate can return in ME3, but that doesn't mean they'll be squadmates. Look at Legion and Mordin, who have only been confirmed to return in ME3 "in some capacity". The majority of ME2 squadmates may end up being reduced to the same non-squadmate circumstances.