Walsh has been out of action since breaking his leg last July. While out, he has also required surgery on an ankle problem.
The 27-year-old scrum-half made 18 appearances for Saints before his injury, and will hopefully be back out on the pitch within a matter of weeks.
“He had complications with his ankle before he did his leg and we got that sorted out after his leg had healed,” Cunningham said.
“There have been a few complications with the bits and bobs (screws and plates) inside his leg so they have been removed.
“It was the right thing to do for Luke. It feels like a normal leg to him now – no screws or plates in the bones. He is in a good place now and hopefully will be back around the start to the second week of April.”