The 20-year-old winger is manager Dean Shiels’ third signing of the transfer window.
“I’m delighted to come here to Dungannon,” said Walsh.
“I’ve had a wee spell out and I just can’t wait to get back playing matches. I would like to say thanks to Dean for bringing me into the team.
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“I got released by Derry City and Dean contacted my agent to get me down to training and we sorted things from there. “I was at Swansea City from I was 16 until 19 years old and after that I went to Derry for a year.
“I’ve played along with Luke McKendry (Swansea City) and Michael Glynn (Derry City) before so it was good to know a few of the lads already before I started training.”
Shiels added: “I’m really delighted to get Marc, he’s been in training with us for a while now and he’s got fantastic potential and great qualities that we are looking for. He’s going to be an exciting player for us.”
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