Lambert is a confirmed disciple of the Ireland manager and had little hesitation naming his former Celtic mentor as being on a par with two-time European Cup winner Ottmar Hitzfeld.
"Martin O'Neill was a great manager," said Villa's boss, "I know him pretty well and I loved my five years with him. I got my fair share of rollickings off him. But you're a man playing a man's game - you take it.
"He's one of the best managers I've worked with. I still call him 'gaffer'.
"But then I do that with most of the managers I played under. I still say it to Ottmar Hitzfeld. The only difference is that I call him: 'Mr Hitzfeld'.
"He has to be up there. To win two European Cups with two different clubs, Mr Hitzfeld is up there. Has to be.
"But so is Martin. I still keep in contact with them. They might be totally different but they are both fantastic at their jobs."
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