The Let Me Entertain you singer last month publicly challenged the former Oasis frontman to a fight, reigniting a two-decade old feud.
But Field told Williams on their new podcast At Home With The Williamses: “I think it is embarrassing. You are 45, man. You’re going to go in a ring and smack each other? It’s just lame.
“First of all, neither one of you are at your top, peak form.
“You are not in your twenties, I hate to break it to you. You are both peppered at this point.
“Your back’s going to go out, your knees are going to buckle.
“I am going to have to bring you back from the dead after this. I don’t understand it.”
Williams conceded: “This is the festive season of giving and joy to all men, even Liam Gallagher.
“Thank God we have steered this tanker around to where we should be.”
The former Take That star originally challanged Gallagher, 47, to a fight at the 2000 Brit Awards, suggesting they should both put forward £100,000 of their own money on the outcome.
Williams told GQ Hype magazine last month: "I'd love it. But I'd want it to be a professional fight. I've just seen how much KSI and Logan Paul made from their fight and I think we could trounce that.
"But, yeah, I think last time in the noughties Liam wanted to go down to an abandoned railway track or something.
"I don't want to do that. It's got to be f***ing whistles and bells if it happens... Liam and I would be a wonderful thing."
Williams once dated Gallagher’s ex-wife Nicole Appleton.