The Rossoneri have been victorious in their last three games in the league and are within five points of securing a Europa League qualifying spot.
"The fans are intelligent and they must fire push the team even more psychologically. We cannot think of slowing down and instead want to increase our momentum," Seedorf told reporters.
"We have two home games, starting tomorrow with a Catania side that never gives up. It is important that our motivation is always stronger than that of our opponents.
"We must focus on giving our all, which means trying to win. We have six rounds left and want to win them all. It doesn't just depend on us, so that's all we can do."
Milan are currently 11th in the Serie A table.