FLORHAM PARK, N.J. >> Rex Ryan insists it is not time for a quarterback change, no matter who thinks it might benefit the Jets if Tim Tebow stepped in for Mark Sanchez.

The Jets coach says Monday he knows “in my heart” that switching quarterbacks is not the move that will jump-start the team, even after an embarrassing 34-0 loss to the San Francisco 49ers.

Ryan says there’s plenty more that needs to improve than just the quarterback — although Sanchez needs to bounce back from a few lousy performances.

Ryan says Sanchez gives the Jets the best chance to win games as the starting quarterback. But, while they are standing by Sanchez right now, perhaps their biggest potential playmaker — Tebow — is just mostly standing by.