Waterford-born defender picked up a knock against his old club on Sunday but will report for training with Ireland next week
The 31-year-old limped off after aggravating an injury in his club's defeat to Manchester United on the final day of the Premier League season. He did manage to return for a post-match lap of honour.
Despite initial fears over O'Shea's European Championship prospects, he was given the all-clear to convene with the Ireland team next week.
A Sunderland spokesman told the club's official website: "John suffered a knock to his ankle in training prior to the Fulham game, which he aggravated slightly in Sunday's game against Manchester United.
"He was taken off as a precaution and following positive results from a scan last night, he will meet up with the Republic of Ireland squad as scheduled next week."
O'Shea was named in Giovanni Trapattoni's 23-man squad last week and is expected to be a first-team starter at the European Championship.