Dallas Cowboys (3-5) owner Jerry Jones said he is “concerned” about the hamstring injury quarterback Dak Prescott sustained in the third quarter of Sunday’s 27-21 Week 9 road defeat to the Atlanta Falcons (6-3), per Jon Machota of The Athletic. Prescott injured his hamstring on one of his final throws of the game. After Prescott let go of the ball, he appeared to be in pain based on the expression on his face. He was evaluated in the blue medical tent before Dallas ruled him out. Prescott was also dealing with swelling in his throwing hand. CLICK HERE to go to PrizePicks and use code ON3 to re…