Chelsea defender Davide Zappacosta has suffered a serious knee injury in training with AS Roma.
The Italy international joined the Serie A outfit on loan until the end of the season on transfer deadline day after becoming surplus to requirements at Stamford Bridge.
However, the 27-year-old is likely to be out for the rest of the campaign after tearing his anterior cruciate ligament in a training session in a "non-contact incident".
Roma confirmed the full-back had successfully undergone surgery on his right knee in Rome to repair the ligament damage.
"The club can confirm that Davide Zappacosta underwent surgery on Friday afternoon to repair the anterior cruciate ligament in his right knee," a statement read.