Lineker says Chelsea should take the aerial route to upset Barca.
He wrote in the Sunday Telegraph: "Chelsea must overcome a philosophy of football in the semi-final. The only way I can see it happening is by reverting to tactics that are the polar opposite to everything Barcelona represent.
"Javier Mascherano is not a centre-half. We saw against AC Milan in midweek how he can get caught out of position. If Barcelona can be put under sustained pressure, Chelsea could score one or two goals.
"To win, Chelsea must play defensive, yet direct. They must play an intense, high tempo game at Stamford Bridge, utilising all the strength, aerial presence and aggression of Didier Drogba at his best."