Former Real Madrid strategist Bernd Schuster does not hide his contempt for teams that play defensively and aim only to disrupt attacks in away matches against Barcelona.
According to the German specialist, the tactic that defeated the Spanish team in last season's Champions League final by London's Chelsea became a bad example.
Speaking about the Champions League group stage match where Barcelona defeated Glasgow Celtic 2-1 after a hard-fought battle, Schuster said: "I'm tired of these kind of games. Teams like Celtic should not be in the Champions League.
"Last season we saw that with Chelsea. It was a very bad example - it's a shame that the London team won trophies. It's not fair when the whole Celtic team just defends and barely manages to get a point."