The winger had been linked with a move to St Johnstone as part of a swap deal for midfielder Liam Craig, but he has now joined the Dingwall side.
County manager Derek Adams has also confirmed he is looking to add another two players to his squad.
"We have agreed terms but until the paperwork is finalised we cannot reveal the names," he said.
"We know where we need to strengthen. It's being able to get the players that are going to come to Ross County on the money that we pay. That's the biggest issue we have."