Wesser weighed in for the white collar fight night last week at the Hard Rock Cafe in Sydney, weighing in at 86.4kg.
His opponent weighed in at 100.4kg, meaning Wesser will have to use his speed and agility to win his first amateur bout.
"My training has been really intense," Wesser said.
"I've been doing three sessions each week and this is my fourth week of training.
"It's been a great experience and the event itself will be excellent, and the best thing is that we're supporting Souths Cares.
"I knew he'd have me for weight, and I was in a bit of shock when he walked out on stage at the weigh-in!
"I feel like I've done some good training, but I haven't seen him fight yet.
"I know I can run if I need to!"
Wesser says this experience has got his competitive juices flowing again.
"When you're in there sparring you get that competitive edge back," Wesser said.
"The body takes over and you want to compete at that elite level again.
"I'm really looking forward to Saturday night and hopefully we can get a bit of support there and help out Souths Cares as well."
The White Collar Fight Night will be held on Saturday 20 April at the Sofitel Sydney Wentworth, with proceeds from the event going to Souths Cares.
Tickets can be purchased by emailing firstname.lastname@example.org.