Kaboul was speaking after their Europa League defeat to Benfica.
Asked if Sherwood was right in saying the team lacked character, the defender replied: "Not at all. It's not because we've lost two games in a row. We've got a big squad with big qualities.
"We need to work a bit harder.
"When we scored the goal it gave us a push. We tried. The other goal killed us. It was too late.
"In football anything is possible. We're going there to win."
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