Aberdeen midfielder Stuart Duff has signed a new contract at Pittodrie, while Bertrand Bossu and Sammy Stewart have joined on two-year deals.The versatile Duff, 26, joined his hometown team on a short-term contract in January after being released by Dundee United, and he has now been handed a two-year deal.

French goalkeeper Bossu has joined after impressing during a trial period.

The 27-year-old has had short spells at a number of English clubs including Hayes, Gillingham, Darlington and, most recently, Walsall.

Stewart, a 17-year-old midfielder, arrives for an initial £15,000 fee from Irish League side Glenavon.

Jimmy Calderwood has already signed former Kilmarnock midfielder Gary McDonald on a free transfer from Oldham, and is expected to tie up the signing of former Motherwell player Richie Foran from Southend.

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