Italian football resumed night after last Monday's (AEDT) fixtures were postponed due to the shock death of Fiorentina captain Astori.

The atmosphere was understandably subdued at the Stadio Olimpico, where Roma was shorn of attacking edge in the absence of leading scorer Edin Dzeko, who missed out through suspension.

But Manolas came up with a memorable header, thumping home a towering effort after Alessandro Florenzi kept an overhit corner alive and hung up a superb cross to the back-post.

Manolas fell to his knees and pointed to the sky in tribute to Italy international Astori after his goal, which put Roma on track to follow up a 4-2 win over leader Napoli with another three points.

Captain Daniele De Rossi added a 73rd-minute second by stretching to divert a high ball home, with Lorenzo Pellegrini wrapping up the points in injury-time with a close-range finish.

Eusebio Di Francesco's men move four points clear of fourth-placed city rival Lazio as the battle for Champions League qualification heats up, Roma guaranteeing it will end the weekend in third.