Barca meet Huesca later today.
Koeman said, "The situation in the league is we're 10 points back and you can't say we're going to win the title.
"That is being realistic, but it doesn't mean we will stop fighting, even if the situation is complicated. We can't drop many more points. We're not in a situation that allows that.
"If [Atletico] remain consistent throughout the season, it will be very difficult. We can't lose another game if we want to fight for the title. Every dropped point is a missed chance."
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