Celtic cannot try to defend their aggregate lead in the second leg of their Champions League play-off against LASK, according to the club's former striker Cillian Sheridan. Martin O'Neill's side won last week's first leg 3-0 at Parkhead thanks to some sparkling attacking play, although the Austrian champions did also have several chances. Sheridan says Celtic must adopt a similar gameplan in Austria on Tuesday if they are to reach the competition proper and has backed a summer signing to make his mark in the game.