O’Shea reportedly sustained the injury innocuously during a training game.
Aidan O’Shea reportedly suffered a knee injury during Mayo’s first collective training session on Tuesday night, with the extent of the injury not yet known.
The Mayo squad were training together at MacHale Park in Castlebar for the first time since Covid-19 restrictions were eased, allowing GAA inter-county teams to return to training.
The Mayo News reported that O’Shea suffered a worrying knee injury during their first collective training session back but did subsequently walk off the field unaided.
The Breaffy man will be assessed by Mayo’s medical team in the coming days and he is expected to undergo a scan to assess the full nature of the injury later this week.
Mayo begin their Connacht title defence in two months time when they take on Sligo, after their National League campaign, which involves competing in Division 2 with Down, Meath and Westmeath in their group.
O’Shea has played a pivotal role for Mayo over recent years and he was involved in the All-Ireland final defeats of 2012, 2013, 2016, 2017 and 2020.
The 30-year-old has played 58 consecutive championship games for his county since missing the 2012 Connacht semi-final against Leitrim.
Inter-county teams across the country were allowed back to collective training this week ahead of the return of the Allianz National Leagues at the start of May.
Collective training was allowed to return after there were no more known breaches of the Covid-19 guidelines. Dublin and Monaghan managers, Dessie Farrell and Seamus McEnaney, were both hit with 12-week bans for separate breaches.
Dublin players were photographed appearing to take part in an organised group training session just a day after the Government and the GAA announced a date for collective training to recommence.
That was followed by photos and videos of Monaghan players training at what was believed to be the end of March.
The championship draws were made earlier this week and you can see them here.