Now, with the season nearing its half-way point, head coach Michael Bradley has moved to retain the Manchester-born enforcer for another two seasons.
"Sean has been a very good professional in terms of his attitude, his training and work rate," said Bradley.
"He's a good organiser, leader and communicator on the pitch and he's quite a physical player too so all of these attributes led us to the conclusion that he's a good fit for Edinburgh Rugby and we're delighted that he's signed for another two years.
"He's very important to the future of the club."
Edinburgh are unbeaten in Pool 2 after the first two rounds of European action and they face Cardiff Blues in back-to-back games in December.