"I went to England in order to get a better idea of the situation," agent Alessandro Lucci told Sky Sport 24.
"Don't forget that I have another 20 players to discuss, so the trip was not explicitly about Vucinic. Premier League interest for Mirko was a while back and we haven't talked to anyone.
"We are in a discussion faze to understand if the rapport with Roma has truly terminated. There is some unhappiness, as in recent years Roma only appreciated him occasionally. He wanted to stay here for as long as possible, but something has broken.
"We met with director Walter Sabatini and will see him again to realise if this is a dead end."