The 19–year-old can play both as a right-back and as a centre-back.
Jenkinson told Charlton’s official website: “I will always be in Charlton’s debt for the training they have given me since a young age.
“I’m grateful to the club’s Academy and all the coaching staff, so I’m delighted the two clubs have come to an agreement.
“I hope supporters will understand why I can’t turn down such an opportunity, but Charlton will always have a place in my heart.”
