Port Vale have signed former Watford defender Derek Agyakwa.

The 20-year-old, who made two first-team appearances for Watford, enjoyed a successful loan spell with the League Two club.

"Derek is coming in as a player that we can help to develop and grow," said Port Vale boss Darrell Clarke.

"He is someone that we can develop for the future and is a somebody that we are looking to build into the player we know he is capable of being."