Piper in, McSheffrey linked
The 24-year-old winger joined Sunderland from Leicester City in 2002 for a fee of £3.5million.
His time at the Stadium of Light though has been marred by serious injury problems, meaning he has made just four first-team appearances in the last two seasons.
City boss Micky Adams, who worked with the player at Leicester, will assess Piper's fitness before offering him a loan move to the Ricoh Arena.
Sky Blues striker Gary McSheffrey meanwhile has been linked with a move to Norwich City in the transfer window.
Norwich boss Nigel Worthington is thought to be drawing up a list of targets should he sell Dean Ashton with McSheffrey one of the players he wants.
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Go on, get vitalled!