Valero was handed a four-game suspension after being sent off against Parma two weeks ago, when he put his hands on the referee while protesting a red card.

The Spanish midfielder's ban was reduced to three games on appeal, but Della Valle believes it is still too harsh.

"It's a defeat for football," Della Valle told the club's website

"This was an opportunity to take a step towards establishing a constructive dialogue and yet it was passed up, despite the fact that the images are very clear."

Valero served one of his suspended games last week and will now miss a further two - away to Juventus on Sunday and at home to Chievo next week.

Della Valle added: "I'm sorry for Borja more than anything. He didn't deserve a sentence like this."