St Mirren have confirmed the signing of former Derby County striker Callum Ball.
The 21-year-old has penned a one-year deal with the option to extend his stay by a further 12 months.
Ball was released by Derby at the end of last season following a five-year stay with the Rams.
St Mirren start the new Scottish Premiership season with a trip to Motherwell on August 9.
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St Mirren
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Derby County
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