The 24-year-old picked up the injury during Blackburn's Championship clash against Stoke City at Ewood Park on Tuesday, November 3, and was unable to continue after being forced off in the 41st minute.
Alebiosu subsequently underwent a scan on Wednesday, with the results confirming that surgery would be required, leaving him facing an extended spell away from competitive football.
Blackburn manager Tony Mowbray provided an update on the defender's condition following his team's 2-1 victory over West Ham United on Saturday, admitting that the news was disappointing for everyone at the club.
"He had a scan on Wednesday. It's not good news for him obviously," Mowbray said, as quoted by Lancashire Telegraph.
The manager revealed that the Nigerian international could be unavailable for three to four months, with the possibility of an even longer recovery period depending on his rehabilitation.
"He looks like he's going to have an operation which is three or four months, maybe a touch longer. We're all disappointed."
Mowbray also underlined the qualities Alebiosu brings to the team, particularly his attacking contribution from the right-back position, where his pace and athleticism have made him an important option.
"Ryan's a real positive for the team. The attacking threat from right back with the legs and the athleticism he brings."
The injury comes at an unfortunate time for Alebiosu, who will now have to concentrate on his recovery rather than helping Blackburn during the coming months and also missing out on some of Super Eagles 2027 Africa Cup of Nations (AFCON) fixtures.