HITC Sport understands Burton and Bolton eye defender on free transfer.
Crawley Town's Sonny Bradley
Bradley is out of contract at Crawley next month and is set to leave the League Two club on a free transfer.
The 24-year-old impressed for Crawley this season and was a virtual ever-present in the centre of the Red Devils' defence.
Bradley's performances have not gone unnoticed by clubs higher up the football pyramid with his suitors aware the 6ft 5in defender could be a bargain free transfer this summer.
Sonny Bradley - Crawley Town
Bradley began his career at Hull City and had two separate loan spells at Aldershot Town, making 56 league appearances for the Shots when the Hampshire side were in League Two.
The towering centre-half enjoyed one season at Portsmouth before joining Crawley in 2014 and he has made over 150 appearances in his career to date.
Bolton are keen to bolster their defensive options this summer as they look to build a squad capable of mouting a bid for promotion back to the Championship next season.
Championship new boys Burton are also looking to improve their squad and they see Bradley as a bargain addition to their side for next season.