In one of the Champions League "groups of death" on Tuesday, the main favourites will face the most likely underdogs. Despite being regarded as an outsider, the Portuguese club played well against Atletico Madrid two weeks ago. In Madrid, the odds on Atletico to win were around 1.65, but Porto were excellent defensively, so Atletico managed only two shots on target in the match. Porto will take a similar defensive approach in Tuesday's match against Liverpool. The Merseysiders dominated the first leg against AC Milan throughout the match, but got on the fans' nerves when they lost the first half 1-2. Despite Saturday's 3-3 draw with Brentford, Klopp's side is in great form and leads the race for the Premier League title. Porto are unbeaten in the domestic league, conceding just four goals in seven games. The home side have an organised defence that was on display in Madrid. Liverpool will also be looking to improve defensively after meetings with Brentford and Milan. It is likely to be a three-goal game at most.