Evans, who is also a Welsh under-21 internationalist, has already had a trial at League One side Cheltenham Town, but was not offered a deal and has now decided to come North of the Border to try and win a contract with the Highland Capital club.
"Sean did fine in his first training session with us, but it's going to take him a little bit of time to settle in," said Brewster. "It's the same with any player that goes on trial. They take a little bit of time to bed in and Sean is certainly no different.
"Midfield is probably the one area of the team where we're well covered, but the difference with Sean is that he's predominantly a wide player who could offer us something different."