Jarrett Jack’s eye is starting to wander. When the Knicks’ starting point guard came back from the All-Star break, he was devout in his belief of wanting to stay a Knick the rest of the season, even if his role was reduced. After owning the starting spot since the season’s fourth game, Jack, 34, came back to a whole new world. He hasn’t seen the court in three straight games. Jack may not have fully expected the startling transformation to his role. The Knicks prefer to stick with Jack as a mentor for their three 25-and-under, point-guard lottery picks. And though Jack is leaning toward not making a fuss, he finally admitted he might explore “my possible options’’ with Thursday’s approaching waiver deadline on playoff eligibility. “People have brought it up to me,” Jack said after his latest DNP in the Warriors’ 125-111 rout of the Knicks on Monday. “It wasn’t something I was super thinking when the situation changed. But if it happens, it happens. I try to control what I can control. Right now this is my role for the moment. I’ll try to be good at that as I was at the other one.’’