By Sean Walsh Liverpool goalkeeper Alisson has admitted he “would be on fire” if he were in Manchester United’s camp ahead of Sunday’s trip to Anfield after the Red Devils lost 7-0 there last season. The Reds play host to their Mancunian rivals this weekend looking to keep their place at the top of the Premier League table. United head to Merseyside looking to avenge their 7-0 hammering back in March, but are in low spirits having been knocked out of the Champions League in midweek. In an interview with the Guardian, Alisson – who was on the receiving end of a 5-2 drubbing to Liverpool with Ro…