Kilmarnock completed the signings of two more players on the weekend.
"We would like to wish both players every success during their time at the club."
Stewart kicked off his career at Falkirk and has since spent time with the likes of Bradford City and Dundee whilst former Rangers midfielder Nicholson has spent most of his career with Dunfermline Athletic, Aberdeen and Preston North End. He most recently played with Fleetwood Town.
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