Diego Simeone believes Atlético Madrid will have to improve on the performance that knocked out Manchester United if the Spanish champions are to beat Manchester City in the Champions League quarter-finals. Simeone’s side are at the Etihad Stadium for Tuesday’s first leg, having knocked United out 2-1 on aggregate in the previous round, their 1-0 victory at Old Trafford in the second leg proving decisive. The Argentinian was asked about what will be required to progress. “United had different...