Alan Shearer shot down Gary Lineker while the Match of the Day duo discussed Marcus Rashford following Manchester United’s 2-1 defeat to Brighton on Saturday. The Red Devils were flat during the match at the Amex Stadium, with goals from Danny Welbeck and Joao Pedro giving the hosts all three points. There were a number of disappointing performances on the day from United. And Rashford was one player who failed to shine, with the 26-year-old replaced by Alejandro Garnacho for the last half hour of the match. Shearer and Lineker both discussed the England international on Match of the Day. Line…