Former Juventus goalkeeper Stefano Tacconi believes Wojciech Szczesny's erratic displays between the posts could cost Roma results this season.
The Poland international arrived from Arsenal in the summer as a replacement for Morgan De Sanctis, but has endured inconsistent displays in both Serie A and the Champions League.
His costly mistake in the Champions League against BATE Borisov in September saw the Giallorossi lose 3-2, leading Tacconi to claim he is a liability.
"He’s a good goalkeeper, there’s no doubt about that,” Tacconi told Gazzetta TV.
“But he’s an uncontrollable lunatic – he’s completely mad. And for this reason he’s a risk."
Szczesny has started 12 games in all competitions this campaign, but only managed one clean sheet to date.
The 25-year-old custodian moved to Stadio Olimpico following the arrival of Petr Cech to Arsenal.