Diao: We must improve

"If we want to give ourselves the best possible chance of qualifying then we need to win our next match," he told the official site.

"With Monaco winning and ourselves losing to Olympiacos, the group is very open. All four teams can still qualify and we must improve if we are to reach the knock-out stages.

"We can't afford to lose many more matches because the other teams will take advantage and open up a lead at the top of the group."