Walker has already scored 11 times in 18 appearances for Barrow this season, taking his tally for the Bluebirds to 64 in 176 games in all competitions.
The forward joined Barrow in the summer of 2007 after spending six months at Morecambe, where he only made one league start.
Cumbria-born Walker started out as a trainee at Scottish side Dundee but never made a first-team appearance.
In 2004 he signed for Greenock Morton, where he made 22 Scottish Division Two starts, scoring 12 goals.
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