Dell made the switch to Glasgow following three seasons at London Irish, making 40 appearances in total for the English Premiership outfit.
Prior to his move south, Dell represented Edinburgh over five seasons, having initially made the move to the capital in 2014.
His form during the 2016/17 season for both club and country saw him called into the British and Irish Lions squad as injury cover on the 2017 tour of New Zealand, becoming the 834th player to pull on the famous red jersey when coming off the bench against the Hurricanes in the final midweek match of the tour.
South African-born Dell has also represented the Barbarians, representing the invitational side in last month's 26-7 win over Spain in Gijon.