He had a loan period at Motherwell last season, where he was converted from a centre-back to a central midfielder.
Jones says he does not expect to have any other triallists at the club this summer.
Youngsters Josh Magennis, Adam Matthews and Arron Morris joined the senior squad for the trip to Portugal, but Darcy Blake missed out because of a groin strain.
The Bluebirds face a Presidents Select XI in Alcochete on Saturday.
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