WATCH: Liam Harrison goes old school in pocket sparring session with Thai legend Singdam in preparation for ONE 167 return

Liam Harrison is one of the last bastions of the old-school generation, and his preparation for his in-ring return is reminiscent of the bygone days.

The British Muay Thai legend recently linked up with former rival and Thai icon Singdam at Yokkao Training Center in Bangkok, and the pair busted out the old-timers' favorite way of sparring in the pocket.

Harrison and Singdam used a tire to simulate fighting in close distance, practically locking themselves in a confined space to work on both their offense and defensive maneuvers.

Harrison shared a clip from the session on Instagram, and in the caption, wrote:

"Nowhere to hide in there ...Sparring with a legend of this era and former opponent @singdam_1984 #muaythai #boxing #sparring."

Harrison and Singdam fought once in their legendary careers when they met at Yokkao 15 in October 2015 in England.

Nearly a decade after that fight, Harrison is still fighting at the highest level of the sport.

Harrison will face Katsuki Kitano at ONE 167 on June 7 at Impact Arena in Bangkok.

The fight is Harrison's first match in nearly two years after he successfully recovered from a nasty knee injury he suffered in his last fight.

Harrison challenged then-holder Nong-O Hama for the ONE bantamweight Muay Thai world title at ONE on Prime Video 1.

Nong-O, however, tore the anterior cruciate ligament in Harrison's left knee forcing 'Hitman' to sit on the sidelines for almost two years.

Harrison's fight against Kitano, and the entirety of ONE 167, is available live and free to all Prime Video subscribers in the United States and Canada.

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Liam Harrison is ready to bring it all out at highly anticipated return

Coming back from injury usually takes a heavy toll on a fighter's psyche.

Liam Harrison knows that, but he'd rather face the challenge head-on, instead of focusing on the negatives.

In an interview with Fight Energy Films, Harrison discussed his mindset heading into his fight against Kitano in Bangkok.

"It's tough because everyone is different and some people aren't as mentall strong as others. I like going into the fire. I like when I'm looking into the fire and thinking, 'Am I gonna get burned here?' I just go in anyway. I'm not scared to go into the fire."

Watch Harrison's entire interview below: