Swindon manager Danny Wilson has expressed his delight at capturing Simon Ferry, Paul Caddis and Thomas Dossevi.
Celtic pair Caddis and Ferry signed three-year contracts with the Robins on Monday while Togo international striker Dossevi penned a one-year deal on Tuesday following a successful trial period.
Wilson told the Swindon Advertiser: "We felt we had a chance with the boys (Ferry and Caddis) and didn't give up on our first choices. In that respect it is great when it comes to a head like it has.
"And I am delighted to get Thomas because over the week he has been here he's impressed everybody. His training has been excellent and he hasn't been fazed by anything. He has come in, settled down really quickly and I think he will be a big help to us.
"The challenge now for all of them is to get in the team and stay there. There's real competition within the squad now, and nobody would expect to walk into the team and not have to work for it."