O´Connor, 24, has agreed a £2.65million switch to St Andrews after 15 months at Lokomotiv Moscow.
"I think he can make an impact," McLeish said. "He´s two-footed, good in the air and mobile, so I don´t see why not. It may depend on where Birmingham play him. A lot of the managers have been going for a 4-5-1 system and I´m sure he can play up top on his own if need be as long as he is getting service from some part of the team."
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