Jose Bosingwa fired in a cross from the left towards Joao Moutinho but it arrived at an awkward height for the Sporting Lisbon midfielder, who diverted the ball over the bar with his thigh.
Sporting's creative players were too often given too much time on the ball and continued to threaten, with Veloso striking another free-kick and Izmailov striking wide after Everton wasted several chances to clear the ball.
Sporting gradually increased the pressure and Howard made an instinctive save from Moutinho but could not prevent Veloso from stabbing the ball home from six yards.