Celtic's play-off opponents start to become clearer

AGF staged a stunning fightback in Poland [Getty Images]Celtic's potential Champions League play-off opponents became slightly clearer after the latest second qualifying round ties, including a stunning comeback win by Danish champions AGF Aarhus.The Scottish champions already knew that Norwegian counterparts Viking Stavanger and Austria's LASK are potential opponents as both have automatically qualified for the play-off round and will be on the unseeded side of the draw.However, three other pot