Reports in Portugal claim Mattia Perin failed a medical, so his €15m transfer from Juventus to Benfica could be cancelled.
The 26-year-old landed in Portugal last night and was all set to sign a five-year contract.
However, according to Portuguese paper Record, the medical tests were not reassuring and have put the entire move in doubt.
The former Genoa goalkeeper has suffered from a series of injuries in his career, most notably rupturing the anterior cruciate ligament in both knees - the right in April 2016 and left in January 2017.
He also had two operations on his right shoulder in June 2015 and April 2019.