Rob Gronkowski Shuts Down Comeback Rumors The former Patriots tight-end player confirmed his retirement while getting his head shaved for charity on June 2. Rob Gronkowski, via ‘Fox News’ Gronkowski has fueled the rumors in the past, repeatedly joking about his retirement when asked by reporters. Rob Gronkowski, via ‘Fox News’ These rumors about his possible return to the NFL have floated around since he announced his retirement in March. Rob Gronkowski, via Instagram Gronkowski played with the Patriots for nine years, winning three Super Bowls and setting several NFL records.