Brazil World Cup winner Rivaldo has tipped former Manchester City striker Sergio Aguero to make the difference in El Clasico for Barcelona.
Injuries hampered the Argentinian's final season at the Etihad and it has delayed the start to his career in Catalonia following his free transfer.
It's been something of a rocky transitional period for Ronald Koeman's side, with the departure of Lionel Messi meaning they have struggled to meet the high expectations they have set themselves over the last 15 years.
The former Everton manager will be feeling the pressure going into the clash with Real Madrid as they currently sit five points off the pace.
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