Marc Ó Sé: Defence still the number one concern for Kerry 

Marc Ó Sé at the launch of 'The Toughest Season' a picture book to be published in collaboration with the GAA's official photographers, Sportsfile documenting this season unlike any other. Picture: Domnick Walsh/Sportsfile

Marc Ó Sé believes Kerry's defence remains 'a huge worry' and he has challenged manager Peter Keane to establish a full-back line that 'strikes fear into the opposition'.

Keane and coach Donie Buckley were credited with improving the Kingdom's defence in 2019 though the concession of three goals in both the League and Munster finals were concerning.