Napoli are on course to qualify for the semi-finals of the Europa League as they remain goalless against Wolfsburg at the break in their quarter-final second leg at the San Paolo.
The visitors, needing to overturn a 4-1 deficit from the first leg in Germany, set about trying to get a goal immediately, and pushed forward from the off.
Within the first minute, Daniel Caligiuri charged down the right flank before whipping in a dangerous cross that Ivan Perisic flicked goalwards.
The ball bounced deceivingly high, with goalkeeper Mariano Andujar having to leap to his right to parry away from goal.
Wolfsburg continued to press and saw Nicklas Bendtner's header from Christian Trasch's cross fly just wide in the eighth minute.
Midway through the first half Trasch also missed the target with a shot from the area, while Caligiuri and Josuha Guilavogui forced blocks from the opposition defence.
Gonzalo Higuain, however, came close to snatching a goal for Napoli late on in the first half, but the Argentine striker's effort from Faouzi Ghoulam's cross flew just wide.
