Tassotti said: "We shouldn't be happy with this draw. It's a game we should've won. We approached it badly in the first half and weren't aggressive, did better in the second and created many chances albeit against 10 men.
"The team did what it had to in the second half, but we took too long to score a goal. If [Alexandre] Pato's shot had gone in, we would've probably gone on to the victory.
"Ronaldinho is criticised because he is a great champion and there is pressure around him, just as there is around the team. The results aren't coming.
"We changed the system to a 4-4-2 in order to spread out over the field better and concede fewer counter-attacks."