Dec 7 (Reuters) - AS Roma suffered a 1-0 defeat away to Cagliari in Serie A on Sunday, with a second-half red card for Mehmet Celik leaving them unable to prevent Gianluca Gaetano's late winner.

The loss denied Roma the chance to narrow the gap to leaders Inter Milan, leaving them fourth on 27 points. Leaders Inter are on 30 points after their 4-0 win over Como on Saturday.