The Scot spent a number of seasons playing under O'Neill at Celtic and he leaped to the defence of his former boss after eccentric replacement Paolo Di Canio labelled the squad unfit and full of perenial underachievers.
|ASTON VILLA LATEST
|18/1||Aston Villa are 18/1 with Bet365 to beat Sunderland 3-1
"Listen, I worked under Martin at Celtic for five years and he was a breath of fresh air up there. He was absolutely brilliant. He took Celtic by the scruff of the neck when it was dead on its knees, got us to a European final and winning trophies again.
"That was a really tough thing to do in that period because Rangers were a really good side then. A top, top team.
"I've spoken to Martin since he left Sunderland and he's fine. I am sure he will be back in the game soon."
O'Neill spent five years at Villa Park before moving to Sunderland in 2011, having previously managed Lambert at Celtic from 2000 to 2005.