He may be the greatest quarterback of all time.

But Tom Brady was humbled when he came head-to-head with the famous wrestler, Goeido Gotaro, - who has won multiple championships himself - in Tokyo, Japan.

Brady, 39, had stopped in on the wrestler's training session with his eldest child Jack when the Japanese champion, 31, convinced him to give it a go.

Although the quarterback clearly lost, he says his time with the wrestlers was 'special'.

'For them to welcome me means very much to me,' Brady told Kyodo news. 'It's hard to describe in words how special that was.'

You win some, you lose some: Tom Brady, 39, (right) proved he was no match for the sumo champion, Goeido Gotaro (left) , when he dropped in on the wrestler's training session in Tokyo, Japan

My goodness! Before Brady entered the ring, he marveled at the wrestlers and mouthed: 'Wow, my goodness'

Brady - who has been touring Asia for the last five days to promote sports gear company Under Armour - asked many questions about training and fighting before he decided to give it a go himself.

Brady can be seen mouthing, 'Wow, my goodness' while watching two sumo wrestlers battle it out.

Head down and with a stern face, Brady gets into position before attempting to push the wrestler.

He then charges forward and pushes against the heavy set wrestler who stands steadfast, even though the four-time Patriot champion was using all his might to thrust him backward. After a few seconds, Brady gives in.

Even though Brady was no match for him, Gotaro said he was man of 'great presence' but also 'humble' and curious about sumo.

Brady then entered the ring with his nine-year-old son Jack afterwards and posted a picture of the family face-off on his Instagram page, with the caption: 'Brady vs Brady #therecanonlybeone.'

Entering the den: Brady enters the ring bare-chested and in navy pants - after Gotaro convinced him to try wrestling

Giving up? The Patriot champion charges forward and pushes against the heavy set wrestler who stands steadfast. Within seconds, Brady gives in

Family face-off: Brady then went head-to-head with his eldest child Jack, 9, pictured. He snapped a picture and posted it on his Instagram page with the caption: 'Brady vs Brady #therecanonlybeone'