GLASGOW, Scotland (AP) — Celtic manager Martin O’Neill has undergone a “small procedure” in the hospital, the Scottish champions said Wednesday.

The 74-year-old O’Neill, who signed a one-year contract extension in June, remained hospitalized but was expected to be released this week.

“In response to speculation, we can confirm that Martin O’Neill has undergone a small procedure in hospital,” Celtic said in a statement without providing further details on the nature of the procedure.

“We would envisage Martin being released from hospital in the next day or two,” the club added, “and on behalf of Martin we would like to thank supporters for their kind wishes.”

O’Neill led Celtic to the Scottish league-and-cup double last season. He had two interim spells during the last campaign, the second of which ended with a winning run in the Scottish Premiership that saw Celtic snatch the trophy from the grasp of Hearts. A week later, Celtic beat Dunfermline to win the Scottish Cup final.

O’Neill’s contract includes the option of a further year.

The Northern Irishman was also Celtic manager from 2000-05, leading the team to three league titles and three Scottish Cups — and a domestic treble in 2001.

Celtic plays at Kilmarnock on Sunday.

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