Francesco Totti's thigh strain is improving rapidly, but he still has a race against time to be ready for the Rome derby.
The Roma captain limped off during the 3-1 win over Atalanta and was diagnosed with a right thigh strain.
Tests at the Villa Stuart clinic on Thursday showed the lesion has reduced by 50 per cent already, so faster than predicted, but it remains to be seen if he can fully recover to face Lazio next Sunday evening.
Giallorossi medical staff hope to see further improvement over the weekend before performing new tests on Monday.
Meanwhile, Roma should have goalkeeper Maarten Stekelenburg back for the first time since he was knocked unconscious by Inter defender Lucio.
The Dutch international tried going back to training this week, but developed a headache as time wore on.