The team is on the verge of sealing a spot in the post-season, but missed the chance to clinch their spot with a 100-99 defeat to the Denver Nuggets last night.
The coach told reporters: "We've got to be better. There's no ands, ifs or buts about it. We've got to be better, and we've got to do a better job of taking care of business and closing out possessions and putting teams away. We can't hide from that.
"I'm sure [the fans will] forgive us if we handle our business. It is definitely not ideal."
The Warriors face the Los Angeles Lakers later today.