Mission accomplished as Bayern Munich lay down title marker

Football - Bayern v Olympiacos - Champions League Group Stage - Group F - Allianz Arena, Munich, Germany - 24/11/15 Bayern's Arjen Robben, Thomas Mueller and Robert Lewandowski (L-R) celebrate after Lewandowski scored a goal REUTERS/Michael Dalder

BERLIN (Reuters) - Bayern Munich have been Champions League title contenders since the season start but Tuesday's 4-0 win over Olympiakos which secured a spot in the knockout stage will act as a serious warning to any challengers, with the Germans in sensational form.

Bayern have scored a staggering 17 goals in four of their five Group F games -- more than four per game -- as they booked a spot in the round of 16 with a game to spare following their demolition of the Greek champions in Munich.