Evan Ferguson limped off injured for Brighton in their Premier League clash with Chelsea at Stamford Bridge on Saturday afternoon.
The 18-year-old went off in the 35th minute after suffering what appeared to be an ankle injury.
Ferguson was having another impressive game as he hit the crossbar in an all-action display.
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Then he forced a fine save from Chelsea goalkeeper Kepa Arrizabalaga with a header that caused him to land awkwardly.
That was the moment that seemed to cause the injury, with the Bettystown man able to walk off the pitch before being replaced by Danny Welbeck.
Welbeck would score after coming on to cancel out Conor Gallagher's opener for Chelsea.
Ferguson has enjoyed a breakthrough season in the Premier League and has become a regular starter for a high-flying Brighton side.
He bagged his first international goal in Ireland's 3-2 friendly win against Latvia at the Aviva Stadium last month.
And his injury will be a worry for Stephen Kenny ahead of Ireland's Euro 2024 qualifying clash with Greece on 16 June.
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