Celtic take on Rangers this weekend in the final of the Scottish Cup and Johan Mjallby believes his old side could have an advantage over Philippe Clement’s outfit. Both sides can claim their second piece of domestic silverware this season at Hampden; however, Brendan Rodgers has a perfect record in the competition, winning all of his 16 contested matches. The Irishman has led Celtic to a run of just one loss in 24 matches; meanwhile, he is yet to taste defeat against city rivals Rangers, claiming three victories and a draw at Ibrox under difficult circumstances. Nevertheless, one-off matches …