Justin Timberlake has remained tight-lipped in the aftermath of his DWI arrest … but his lawyer says he’s ready to fight tooth and nail for his client, which is interesting.

JT’s defense attorney, Edward Burke Jr., tells TMZ … “[We] look forward to vigorously defending Mr. Timberlake against these allegations. He will have a lot to say at the appropriate time.”

Ed adds … “He is currently awaiting full discovery from the DA’s office.” It almost seems like Justin and co. think the arrest and subsequent charges are BS — that’s the vibe here anyway.

This statement comes 2 days after Justin was arrested in Sag Harbor, NY for allegedly driving while intoxicated. As we reported … the *NSYNC alum was pulled over by local cops after they claimed he blasted past a stop sign and was seen swerving on the road.

While Justin allegedly told the arresting office he only drank one martini at The American Hotel — where we’re told he was enjoying a night out with friends — cops claim Justin had bloodshot/glassy eyes, a strong odor of alcohol on his breath, slowed speech, etc.

They also claim JT failed a field sobriety test and refused to do a breathalyzer … resulting in cops slapping cuffs on him and taking him to jail. He spent the night behind bars and was released without bail Tuesday morning … where Edward was photographed by his side.

Justin is due back in court in July … but his world tour seems to be unimpacted by the drama. He’s still expected to perform Friday and Saturday at the United Center in Chicago.