Louis Reed will continue his career away from Bramall Lane on a permanent basis, although the Blades have protected themselves in the future by inserting a sell-on clause.

The 20-year-old, who spent last season on-loan at Chesterfield, where he made 47 appearances, has joined Peterborough United for an undisclosed fee.

At the Lane, Reed became United's youngest ever first-team debutant in March 2014 and made a total of 59 appearances as a Blade, the last of which came in August 2016.