The Celtics might have the services of history’s most prolific three-point shooter when they meet the New York Knicks Tuesday night with a chance to wrap up the Atlantic Division title. (Boston Herald)

Though Ray Allen remains questionable for tonight’s game against the Knicks, the guard has taken the first step toward activation after missing the Celtics’ last four games with a sprained right ankle.

Allen is expected to join the team here for tonight’s game and will be a gametime decision, according to team president Danny Ainge.

“If he’s flying, then that has to be considered an improvement,” Ainge said. …

“He’s done some running on the treadmill,” Ainge said. “He’s also done some shooting. So we’ll see what happens.”

Allen’s injury weirdly helped the Celtics develop a five-man unit among the best in the NBA, and pushed along Avery Bradley’s development to the point that Bradley now drills occasional three-pointers in transition, holding up his hand afterward in a pose, as if to say, “Yeah, you might actually have to defend me now.”

But regardless of how well the Cs have played in his absence, the three-point king’s return would help — whenever Allen becomes available off the bench, the Celtics become all the more potent.