Travers suffered a hand injury and, after undergoing medical treatment and having an x-ray, it was decided that the AFC Bournemouth player should be released in order to let it heal.
"It is an injury that Alan Kelly [goalkeeping coach] and the Doc [Alan Byrne] has never seen...he's got a displaced fracture of his thumb," McCarthy told FAI TV.
"It's really sad for us because he's a great lad to have around the place and a good goalkeeper, but he's got to go back and get it repaired if he wants to be ready for the start of the [Premier League] season."
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Introduction:
Republic of Ireland manager Mick McCarthy is assessing his goalkeeping options after Mark Travers left the squad following an injury sustained during the training camp in Portugal.