Charles Dunne signed for Blackpool for an undisclosed fee in August 2013 but immediately returned to Wycombe Wanderers on loan.
The left-back agreed a three-year contract at Bloomfield Road but broke his leg playing for the Chairboys in December 2013, ruling him out for the entire season.
Now fully-fit again, the 21-year-old will look to make an impression in tangerine ahead of the new season.
He made his Blackpool debut against Ipswich Town in November 2014.
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