"He was very respectful when speaking about our club at the end of last season and during the summer," manager Sean Dyche told the club's website.
Barton played once for England during a controversial career in England and France - where he spent a season with Olympique de Marseille -- scoring 31 goals in all competitions but collecting eight red cards.
(Reporting by Neville Dalton, editing by Pritha Sarkar)
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