The Serie A holders and league leaders are now 48 games unbeaten in Italy.
However there were suspicions of offside over their winner from Arturo Vidal, whilst Catania had earlier had a perfectly good goal ruled out. Giuseppe Marchese was also sent off late on for the hosts.
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Who of Europe’s top strikers will move to England this summer?
After a dreadful start to their Bundesliga campaign, Borussia Dortmund appear to have weathered the storm after going five matches without defeat.