Mitch Marsh has revealed that doctors initially feared he had ruptured a testicle in a training mishap that sidelined him from Western Australia's recent JLT Sheffield Shield game.

In the latest setback during what the younger Marsh brother admits have been "probably the most challenging eight months of my life", the allrounder was hospitalised last week after a blow to the groin in the nets.

Doctors initially feared the worst, but surgery showed the Warriors captain had suffered severe bleeding in the area rather than a rupture.

After missing WA's defeat to New South Wales at Bankstown Oval, Marsh is now set to return for the clash with South Australia starting Sunday at the WACA Ground.

"I basically got hit in the box by one of our coaches on the flicker (a ball-throwing instrument)," Marsh explained.

"Usually, when you get hit in the box, it lasts for a couple of minutes and goes away. But after half-an-hour, I was in the exact same pain.

"I got taken to hospital to double check. I had a scan where they thought I potentially ruptured one of my testicles. But once they got in there, it was just basically severe bleeding. It was best-case scenario.

"It was pretty sore for a few days. They're still both working hopefully so it's good."

Marsh is still experiencing soreness, but is confident he'll be fine to tackle the Redbacks.

"Physically, I'm ready to go," Marsh said.

"I'm going to be pretty sore still going into the game, but that's fine. In that area, it's more a mental thing getting back into it.

"Once you get out in the middle and your competitive juices are flowing, I won't be thinking about this at all."

Having been appointed a Test co vice-captain at the beginning of the summer, Marsh has since had a season to forget, losing his spot in Australia's Test, ODI and T20 sides.

The 27-year-old said the constant setbacks this summer were hard to swallow, but hopes the coming Shield round can help reignite his love for the game.

"It's been probably the most challenging eight months of my life in terms of cricket and all sorts of stuff," Marsh said.

"At times, I've certainly got down on myself, because you just want to do well and I love playing cricket.

"I probably got too down on myself and worked too hard and tried so much to try to score runs that I probably stopped enjoying the game at a point throughout the summer.

"Ultimately, I play the game to enjoy it with my mates and have fun.

"My next three weeks is about that and, hopefully, I'll be able to contribute with a few runs."