I would hope so.
But if we are a team that Douglas Costa would add a lot to, then we're a lot worse of than I thought.
I could see a player like him adding a lot to a team like Cagliari or <insert random team>, but that's about it.
Wait, I actually don't even see that. Since in order for a player to add something to a team, he'd need be free from injuries for more than 3 weeks a season.