Pep Guardiola admits the challenge of winning the Champions League has only just begun after seeing Manchester City cruise into the quarter-finals.City kept their quadruple dream alive after beating Borussia Monchengladbach 4-0 on aggregate to make the last eight.Goals from Kevin de Bruyne and Ilkay Gundongan saw City cruise past Gladbach 2-0 in the last 16, second leg in Budapest.The Premier League leaders will go into Friday's draw as red hot favourites to go on and conquer Europe for the first time in the club's history.But City have suffered some humiliating defeats in the latter stages of the competition in recent seasons and Guardiola knows he can take nothing for granted.He said: "It was a good performance, but this competition can.
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