Greg Stiemsma has an offer sheet... and it's not from Minnesota

According to ESPN Boston's Chris Forsberg, center Greg Stiemsma has an offer sheet above the Boston Celtics' qualifying offer. We heard a while ago that Minnesota was going to offer him $3 million, which is more than the Celtics can offer him with their biannual exception ($1.95 million). However, it looks like Stiemsma's offer sheet is NOT from the Timberwolves, according to ESPN Twin Cities Darren Wolfson. It's not clear as to who the other team is at this time.

Any guesses as to who the offer sheet might be from? Post them in the comments.