According to "Football Market" news, Manchester United hopes that Roma will pay 20 million euros in transfer fees for Smalling.
Smalling was loaned to Roma by Manchester United last summer, and he performed well in Serie A last season.
Rome has always wanted to buy out Smalling, but it is difficult for them to pay more than 13 million euros in transfer fees.
Smalling's contract with Manchester United will expire in two years. He also had scandals with Inter Milan and other teams.
Smalling, 30, joined Manchester United from Fulham in the summer of 2010. He played 30 times for Roma in Serie A last season, scoring 3 goals and assisting 2 times.