In 1975, he went on loan to Lanerossi Vicenza in Serie B to 'build up his bones' (Bruno Conti another future Roma star, was dispatched to Genoa for the same reason), returning to Rome in 1976 as one of the leading and indispensable players of the team.

After Nils Liedholm's return as coach of A.S. Roma, Di Bartolomei became the team's undisputed leader, raising to the title of captain and becoming a fan favourite.

"[2] Despite his goalscoring prowess, Roma had several superb playmakers, in Di Bartolomei, compatriot Bruno Conti, and the Brazilians Falcão and Toninho Cerezo.

Thus, Liedholm decided to move Di Bartolomei in front of the defence for protection, knocking precise passes up the field, with Falcão and Ceerezo played in the centre, while Conti would assume a more attacking role behind the forwards.

A quick and hard-working midfielder, although he was not gifted with significant pace, he was known for his stamina and long stride, which enabled him to cover the pitch effectively.