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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Liverpool have unveiled their new home kit for next season, sticking with the hugely popular retro styling of the current shirt.
The reputation of the Premier League means it is the most popular and one of the most watched leagues in the world.