FOXBORO — Four days out from the Patriots’ regular-season opener, Christian Gonzalez still was not ready to return to the field.

New England’s star cornerback missed practice again Wednesday, further clouding his status for Sunday’s Week 1 matchup against the Las Vegas Raiders at Gillette Stadium.

“He’s continuing to work, and he’ll do some stuff on the side,” head coach Mike Vrabel said before practice. “I’m not going to rule anybody out (for Sunday). … We’ll continue to work and treat and make sure that we’re doing everything that we can to help him and he’s doing everything that he can to get back on the field. That’s the only update that I have right now.”

Gonzalez, a second-team All-Pro last season, injured his hamstring on July 28 and has not practiced since. He has been present a

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