Barcelona coach Pep Guardiola blasted Guus Hiddink's tactics for Chelsea's 0-0 draw at the Nou Camp last night.
He said: "Only one team was trying to play attacking football and the referee should have taken that into account. We weren't out there shoving players or making poor challenges. Michael Ballack might have been sent off.
"Ballack played in an aggressive way throughout. The referee didn't have his best night. It's not acceptable for a Champions League semi-final. We committed seven fouls and Chelsea committed 20, and yet we both ended up with the same number of bookings."