Diego Costa is back to the premier league after a long time out. It's on free transfer to Wolverhampton, and signed a contract until June 2023, just a season with the English side. He will definitely putin his energy and gives a good results to wolves.
I can't wait to see Diego Costa play in the Premier League again, he is one of those players that quite a lot of people have missed in the Premier League, for obvious reasons, too bad he won't be in the spotlight like he was then, because he isn't moving to a big club, but nonetheless he is a player with a big personality and character and i expect him to be in the news, both for good and bad reasons. 
Wolves have not started too brightly this season, so i guess he could help them, so they don't find themselves in a relegation battle sometime in the season.