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Cr Thomson, a two term city councillor, is also a member of the Southern Partnership Group, tasked with overseeing the $300 million rebuild of Dunedin Hospital.
He told the Otago Daily Times yesterday he was yet to decide his political future, but could step down as a councillor at next year's local body elections to focus on his health role.
''I'm stretched, quite obviously. I'm managing at the moment, just, but I don't know how much of my time is going to be involved with the hospital rebuild stuff.''
Cr Thomson said he would make a final decision ''close to deadline'' ahead of next year's election, but his first priority was the Dunedin Hospital rebuild.
''I don't mean that to negate my role as a councillor, but health has always been my first love and I think this is just such an important project.
''I want to see it come to fruition and having spent almost 15 years in health, and dealing with crap facilities, obviously there's a big part of me that would want to see it come to fruition.
''That would have to be my No1 priority,'' he said.
Cr Thomson, the former Otago District Health Board chairman and Southern District Health Board member, also owned the Acquisitions retail chain, which added to the pressure on his time.
He was first elected as a city councillor in 2010 and appointed deputy chairman of the council's finance, strategy and development committee.
In 2013, he was re elected and named chairman of the council's finance committee.
But, asked yesterday if he harboured any ambition to go further and challenge for the mayoralty, Cr Thomson said: ''Absolutely none.''
''That's hand on heart - absolutely definite.''
Instead, he would have to decide by next year's election whether there was still time in his schedule for civic affairs.
''I'd love to stay on in council, and if I think I can, I will. But I don't think I'm in a position to make that call at this stage.''