Con O'Callaghan could miss the start of Dublin's Allianz Football League campaign after suffering a shoulder injury before UCD's Sigerson Cup match with UUJ.
The two-time All-Star sustained the injury in the warm-up and was unable to play a part in the game.
The Cuala forward is expected to meet with the Dublin medical team this week to assess the injury.
The five-in-a-row All Ireland champions start their league campaign against Kerry at Croke Park on January 25th, in a repeat of last season's All Ireland final.
Dessie Farrell's opening game in charge of the Dubs ended in a one-point defeat to Longford in the O'Byrne Cup on Saturday.
However, Farrell didn't have any of his All Ireland winners available and made a total of 23 changes during the game.
The Dublin manager said only a handful of the players involved at the weekend would have a chance of making his panel for the upcoming league campaign but Niall O’Callaghan, the younger brother of Con did himself no harm with two goals against Longford.