Claim: Diego Costa fails to be a professional footballer.
Evidence: Diego da Silva Costa -LRB- -LSB- ˈdjeɣo ða ˈsilβa ˈkosta -RSB- , -LSB- ˈdʒjeɡu dɐ ˈsiwvɐ ˈkɔstɐ -RSB- ; born 7 October 1988 -RRB- , is a professional footballer who plays as a striker for English club Chelsea and the Spain national team.