Moyes is due back at Finch Farm this week and Irvine claims his friend is still enjoying life on Merseyside, and will beat the odds again next season to guide his team into the upper echelons of the Premier League table.
He told the Liverpool Echo: "From my point of view you can't underestimate David's loyalty. He has been happy there over the years and has a fantastic relationship with Bill Kenwright. They trust each other.
"Davie loves the club and loved working hard. He sees himself as lucky and would probably not look at it himself as being loyal. Yes he's been very loyal but I don't think he's found that difficult."