Jason Bay likely will have until the conclusion of this road trip to show the Mets he deserves to keep his everyday job.

A day after manager Terry Collins told The Post he is considering Mike Baxter for primary left-field duties, a club source yesterday said Bay probably has another week to try and show team brass something.

Baxter, who has been on the disabled list since June 2, is expected to join the Mets tomorrow in San Francisco. Baxter would play against most right-handers and Bay against lefties if a change is made.

Collins placed Bay in last night's lineup against Diamondbacks right-hander Ian Kennedy, and he went 0-for-4 with two strikeouts in the 6-3 loss to worsen his rut to 4-for-35 (.114) since returning from his most recent disabled-list stint.