Chelsea manager Carlo Ancelotti thought his side were denied a clear penalty in Wednesday's narrow 2-1 Champions League last-16 first-leg defeat to Internazionale at the San Siro.
Salomon Kalou appeared to have his heels clipped by Walter Samuel as he was about to shoot but referee Mejuto Gonzalez waved away the protests.
The Ivory Coast international did get on the scoresheet in the second half but goals by Diego Milito and Esteban Cambiasso handed Inter the narrow advantage going into next month's second leg at Stamford Bridge.
"I thought it was a penalty," said Ancelotti. "But it is only a penalty when the referee whistles.
"I think that what we saw tonight, we have the chance to turn it around. I think we played well. We leave without a positive result, but it's not an ugly one either.
"We will play to attack and win the second leg in the same way we did in this game. We tried to attack and score from the first to the last minute."