The Rossoneri slumped to a disappointing defeat on Saturday after missing a host of chances
The Rossoneri made a number of changes ahead of the second-leg of their last-16 Champions League clash with Atletico Madrid next week.
And though Seedorf insists he still picked a competitive side on Saturday, he revealed his displeasure at the wastefulness of his players in front of goal.
"I liked a lot of our play down the flanks and a couple of the crosses and above all our commitment," he told reporters after the game.
"The players helped each other out a lot and they tried to turn the result around until the very end. Then it’s obvious that we weren’t decisive enough in front of goal. I didn’t like this lack of cynicism in front of goal.
"All the players have to be used. [Adil] Rami couldn’t play this match, while we rested the others. [Riccardo] Montolivo can’t play in the Champions League and we’re not sure about the condition of [Nigel] De Jong and [Andrea] Poli ahead of Madrid.
"We’ve got faith in our squad. Against Sampdoria it went well, today it didn’t. There was a lot balance out on the pitch. The decisions I made today were also influenced by the internationals. I wanted Balotelli to get some game time. We fielded a competitive team regardless of the changes."
The result leaves Milan 10th in Serie A, while they trail Atletico Madrid 1-0 ahead of their second leg in Spain on Tuesday.