The Irish province announced earlier today that the game with Glasgow Warriors at Thomond Park on Saturday will go ahead as a chance to remember their head coach.
Ireland flanker O'Mahony was one of the many young prospects that Foley, whose funeral will take place in County Clare this Friday, helped nurture at the club.
And he said: "My first game that he coached me at Munster was an U-20 game at Thomond Park, we won it 3-0 and that suited Axel as good as if we'd won it by 70. He wanted to win for Munster at any cost.
"I'm not going to do him justice here, personally he meant a huge amount. He's been there, I haven't supported a Munster team that he wasn't involved in. The amount he's given the club, it can't be calculated.
"I was lucky he was in my position as well, the knowledge he could give to me. At times it was frustrating because he was such a good footballer, he found it difficult to understand that we couldn't see what he could.
"The amount we've lost now that he's gone, the rugby knowledge; the man, the coach and the friend, it's huge."