Chaplow is the first signing for Nigel Adkins who is the new boss of Southampton. The midfielder has not played for North End since the end of last season when he was told by Darren Ferguson that he was no longer wanted at the club.
He has been playing for the reserves but missed Preston's midweek reserve win and then it was revealed that a deal was being struck with Southampton. Only Neal Trotman now remains of the players who Darren Ferguson placed on the transfer list.