HITC Sport understands several clubs are tracking the Bristol City midfielder.
Pack has enjoyed another outstanding season for Bristol City this term, making 46 appearances in all competitions for the club.
The 25-year-old has established himself as a key member of the side since his arrival at Ashton Gate in the summer of 2013 after leaving Cheltenham.
Pack was instrumental in Bristol City winning promotion from League One last season in a record-breaking campaign for the club and he has also been pivotal in helping the club secure survival in the Championship this term.
The classy midfielder has started every game under manager Lee Johnson since his arrival in February and he has captained the side on several occasions in recent weeks.
Former Portsmouth youngster Pack is understood to be happy at Bristol City, but his suitors could test the club's resolve to hang on to the player this summer.