Asked about the strength of the Polish options, McGhee said: "I would take either of those two (Boruc and Szczesny). But, no, I wouldn't swap either of our two goalkeepers for any of their two.
"I think Allan has been fantastic. When we arrived in this job - and remember it has only been a year - the feeling was probably that Marsh was here to support Allan. That has changed in a year.
"I think Marsh is now here to genuinely challenge Allan - and that's not even mentioning Matt Gilks. He has done alright as well.
"Marsh has now become a serious, serious contender. However, I don't think Allan has done anything wrong. I'm talking here from my perspective - not what Gordon (Strachan) has reported to me.
"My personal opinion would be that something has to go wrong with Allan before he is displaced. Of course the manager has a decision to make. But I think Allan is maybe making sure he is holding Marsh at bay a wee bit because of his own performances."
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