Sunderland boss Paolo di Canio says his team needs some hard men.
He said: "The players are very genuine, but very shy. Before what happened to Sessegnon, this team have not had one red card.
"I don't want to see my players getting red cards. But even in terms of yellow cards, this isn't a team that has suffered in that respect.
"I'm not saying we have to have the devil in us because people will say 'Di Canio wants a killer in his team'. But sometimes we are too clean. We need a bit more of an edge."