yes! Gastric sleeve for years was phase 1 of the DS, back in the days when a lot of surgeons did the DS in two stages - first, they created a sleeved stomach, and then, several months later, they'd go back in and bypass most of the small intestine. However, enough people lost enough weight on stage 1 alone that they started offering it as a standalone surgery - and the VSG was born!
long way of saying - of couse you can, since the sleeve is the first stage of the DS.
