Koeman says the Catalans’ setup and style is different now as they do not have the quality they used to possess.
Barcelona were hoping to bounce back from the defeat they suffered in the hands of Bayern Munich in the Champions League group stage last week but it was not the case.
Granada took the lead in the opening two minutes through Domingos Duarte and it only took a late goal from Ronald Araujo to salvage a point for the Blaugrana.
Koeman was asked about the tactics he deployed against Robert Moreno’s men and the Dutchman defended it by insisting that this current Barcelona is not the same as the one under Pep Guardiola and Luis Enrique.
"Look at our squad list," the former Everton coach said.
"We did what we could. We don't have the players from the tiki-taka days. We have to play with our own style.
"I think we did well and, with some more time, we could have won. The basic system was 4-3-3 in the first half, then I had to make changes based on what I had on the bench.
"This isn't the Barcelona of eight years ago. That's the way it is.
"With Ansu [Fati] and [Ousmane] Dembele it's different because we have more depth."
