Carlton have renegotiated their deal with Brendon Bolton, locking in the senior coach until at least the 2020 season.

Bolton is on a unique rolling employment agreement with the club rather than a straight contract, but it is understood the terms of this agreement were revised early this year to give him a pay rise and a stronger commitment until the end of 2020.

Carlton coach Brendon Bolton. Credit:AAP

The Blues have refused to talk about Bolton’s contract or employment situation but it is understood the changes at the start of the year provided greater security for the coach and the club.

The changes were made to better reflect the fact the club had made long-term list changes that would have short-term consequences on the field, such as the decision to trade out best-and-fairest winner Bryce Gibbs.