Frank Lampard has urged Chelsea to unleash the burning sense of injustice over their latest Champions League setback in the second leg of their quarter-final against Manchester United.
Lampard and his team-mates were left fuming after being denied a "blatant" penalty in Wednesday's 1-0 defeat to United, which left their season on the brink of unravelling completely.
Patrice Evra appeared to chop down Ramires in the dying seconds at Stamford Bridge, but Spanish referee Alberto Undiano Mallenco became the latest official to rule controversially against Chelsea in a crunch Champions League match in recent seasons.
Midfielder Lampard, who will not have happy memories of what was his 500th appearance for the club, does not want his team-mates to feel sorry for themselves in the build-up to Tuesday's second leg at Old Trafford.
"We can't really think like that too much because it's negative thoughts," he said. "We just use it to motivate us, really."
He added: "Everyone knows it was a penalty, but he didn't give it - simple as that. I can't believe he didn't give it. It was blatant - everyone in the stadium saw that."