Mourinho scathing of his strikers
"I'm not happy with my strikers' performances, so I have to try things," Mourinho said.
"With Andre at least I know we have one more player to have the ball, we have one more player to associate with the other players.
"Football is also about scoring goals. That is for strikers, for real strikers. I had to try."
Mourinho was scathing in analysing Chelsea's performance, lamenting individual mistakes and a "joke" third goal conceded by the 2012 European Cup winners.
Eden Hazard's penalty had given the Blues a potentially vital away goal, but Javier Pastore's brilliant stoppage-time solo effort, added to Lavezzi's strike and a David Luiz own goal, saw PSG take a two-goal advantage into next week's second leg at Stamford Bridge.
Mourinho said: "The third goal was a joke. It's not a goal. It's a joke.
"We enjoyed the third goal with Pastore. The third goal was Pastore and us.
"We made individual mistakes in areas where for the whole season the guys perform and we have no problems.
"They have the right to make their mistakes, because we have other players that make mistakes the whole season. We paid the price.
"The ball goes to Lavezzi in the first goal, control, half-volley, boom. Top player, top striker. It's like this at this level, one chance, one goal.
"It's difficult for us to score goals. It's difficult for us to score goals, especially when the games are tight.
"It's difficult for us to transform the half-chances into chances and when you make defensive mistakes you are in trouble. That's, for me, simple."
Chelsea, beaten by Crystal Palace last Saturday, have now lost three of their last five games after just one defeat in the previous 17.
But Mourinho maintains the Blues can advance to the semi-finals for a seventh time in 11 years.
"We have nothing to lose now," Mourinho said.
"When you are losing 3-1 there is no approach. We have to try to win 2-0, 3-1, 4-1.
"We have to play thinking that it's possible. And, to be fair, I don't think Paris think that it's done. I think they feel they are in a good position, but I think they know that it's not over."