Paulo Dybala is "one of the most important signings in Roma's history," according to former Giallorossi striker and head coach Rudi Voller.

The Argentina international has made an impressive start to life in the Italian capital, scoring four goals and providing two assists in seven Serie A appearances since his free transfer from Juventus.

The former Bianconeri forward has also netted twice in the Europa League and his impact has caught the eye of Voller, who scored 68 goals in 198 games for Roma between 1987 and 1992.

"He's one of the most important signings in Roma's history," he told Corriere dello Sport. "The fans were waiting for a big hit, and he arrived. [He is] magnificent, and he is fulfilling expectations.

"I hope he can continue like this and not have any physical problems. If Paulo is physically well, he can be devastating with that exceptional left foot."

Voller, who was also briefly head coach of Roma in 2004, offered words of encouragement to striker Tammy Abraham following his steady start to the campaign.

The England international top-scored for the club last season with 17 goals - a tally only bettered by Ciro Immobile (27), Dusan Vlahovic (24) and Lautaro Martinez (21) in Serie A - but has netted just twice in 10 appearances across all competitions this term.

"He must believe in himself; never stop having faith in his abilities because these moments happen to all strikers, even the strongest ones," Voller added. "Then comes the match when you score a hat-trick and everything changes, especially in your head.

"The important thing is to always remain focused on the tasks and duties, even if he doesn't score, Abraham must continue to work for the team, give everything on the pitch."

Roma welcome Lecce to Stadio Olimpico on Sunday aiming to bounce back from their Europa League defeat by Real Betis in midweek, and Voller believes that Champions League qualification should be the Giallorossi's minimum aim this season.

"The victory against Inter was exciting for the fans and put the team back in a good position in the standings," he said. "They have a very good chance of at least making it to the Champions League spots. 

"The beauty of Italian football is that right now there is no Bayern Munich that is superior to all the others. Here, there are five-six teams that can fight for the Scudetto. 

"Roma must now aim for fourth place, then once they've stabilised and found their balance they'll be able to think about even more important objectives."