Arrigo Sacchi believes Barcelona have become too relaxed in their style of football since the departure of former boss Pep Guardiola.
Sacchi, who won two European Cups while managing AC Milan, believes that the Liga leaders - who sit 11 points clear at the top - have lost some of their prowess.
"Barcelona are not so exciting because Guardiola has gone," the 66-year old told reporters.
"Easily winning the league has probably relaxed the team. Lately I've seen a bad image of Barcelona which is unknown for this team."
But the former Rossoneri coach is still wary of the threat of the Blaugrana, who are 2-0 down in their Champions League last 16 tie after Kevin-Prince Boateng and Sulley Muntari scored for the Serie A side in the first leg.
"Milan can run the risk of being defeated if they are afraid," Sacchi warned.