The 22-year-old midfielder has signed a contract with the Glovers until the end of the season, having been training with the club for the last six weeks, and cannot wait to return to the professional game.
He told the Western Gazette: "It has been a really long wait and I have been dying to get stuck in. I had been waiting for the day for six weeks so I am looking forward to getting started officially. There is just so much to be done and I am glad it's sorted.
"It has always been a massive ambition to move over (from Ireland) and I am glad it's finally happening now. I was part time in Ireland but was full time at a point with Sporting Fingal. They went bust and I moved on to Shells.
"I wanted to get back to full-time football. It's always what I wanted to do, I love it here with full-time football and that's the way forward.
"I knew that from the day I came here I wanted to sign. It was about getting down here and hoping that the gaffer (Gary Johnson) would take a chance on me."
Just hours after Dawson's signing was announced Yeovil agreed a permanent deal for his friend, and current house-mate, Paddy Madden from Carlisle.
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