The Catalans are due to face Guus Hiddink's side at the Nou Camp on April 28 for their first-leg meeting, before reconvening at Stamford Bridge the following week.
And 25-year-old Yaya, who joined the La Liga leaders from Monaco in 2007, says he plans to contact his older brother - who is set to play against the Blues for Arsenal in Saturday's FA Cup semi-final at Wembley - for advice on how to defeat last year's Champions League runners-up.
“I must speak with my brother about Chelsea," he told the Mirror. "Kolo will know all about them, especially after playing in a big game against Chelsea this weekend.”
“Kolo tells me that Chelsea is a big club, very strong with a very good squad. They are physical and powerful, and recently they have been playing very well. Really back on form.”
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