Billy McKay, Marc Klok and Ryan Flynn are going to the League 1 club.
Billy McKay will arrive from Wigan on an one-season loan. Last season he was also on loan at Dundee United.
The Dutchman Klok, who's contract at Cherno More recently expired, joins the team on a six-month deal.
Ryan Flynn got the longest deal. He signed a two-year contract and will stay until 2018 at Olham. Flynn played the last five years at Sheffield United.
The club announced on his website:
"McKay is the seventh player to join the club since the arrival of new manager Steve Robinson on Saturday.
"Flynn will be in the squad for Saturday's pre-season encounter with Huddersfield Town.
"Manager Steve Robinson has signed midfielder Marc Klok on an initial six-month contract, subject to international clearance.
"Welcome to the club Billy, Ryan and Marc".