Xavi Hernandez is alleged to have asked Mourinho: "What did you think of the referee?" to which the 'Special One' replied: "Why are you asking me? What about the Chelsea match last season?"
When asked what had happened in the tunnel, Mourinho said: "It's always difficult to lose for those who aren't used to losing. I'm like that too. It's the characteristic of a team which always wins.
"I can never have a problem with Xavi because I adore him. He's one of best in the world."
Gerard Pique is asking for an "impartial" referee for the 2nd leg at Nou Camp and was also allegedly shouting to Mourinho in the tunnel.
"Maybe I have a friend in the volcano and I am responsible for that."
Mourinho did sound a note of caution to his Inter side, heading into next Wednesday's second leg.
He added: "We are not playing a small team, we are playing Barcelona who are a great team with a great coach and great fans.
"We go to Barcelona and we are ahead, and we want to go into the final, but we are not there yet."