The news could have been worse for Keanu Neal.

The rookie Falcons safety left Thursday’s preseason game with a knee injury and will need surgery, but just an arthroscopic procedure that will cause him to miss 3-4 weeks, Falcons coach Dan Quinn said Friday.

MORE: NFL Power Rankings

“From all of us who know Keanu, you know he’s going to put a thousand percent into all the rehab to get ready,” Quinn told reporters. “We know kind of what he stands for and the toughness, so I’d expect the shorter-term [amount of time being out] with him. He’s kind of just built that way.”

Neal, a first-round pick out of Florida, was playing well before his injury. He had five tackles, but was injured while attempting to tackle Dolphins running back Arian Foster. It was the second injury of the preseason for Neal, who missed the preseason opener with what the Falcons called a “trunk” injury.

MORE: Ranking all eight NFL divisions

Quinn also said wide receivers Julio Jones and Justin Hardy would be limited in practice this week with ankle injuries but should be ready for the regular-sea

son opener. The same goes for defensive end Adrian Clayborn, who hurt his shoulder Thursday night.