The two veterans could leave for free at the end of the season if no contract extension is agreed.

"I think, for my part, I'm doing everything I can but ultimately it's between the player and the club to agree a new deal," said Di Matteo.

"I have [told the club I want them to stay]. I'm not aware of where they are right now [in terms of the talks]. The players know I would like them to stay, from my point of view.