Johnson scored the equalizer and created the second goal by Samir Nasri City booked their place in the quarter-finals with five goals in 27 minutes long, but Mancini believes the former Middlesbrough player can always do better and critical role in Wolves second Jamie O'Hara.
He said: "Sometimes, he thinks," Well, in this game, I scored a goal, I support is enough. "I think Adam because he is young, can improve a lot. He needs to think differently."
He added: "He has to think," he noted that the goal, I collected a pass, I go because I want to score another goal and an assist, and return to defend. "
"He can do if they wish. I think it is, it has everything to become one of the best wings."
Mancini added: "Adam is young, he is in his third season in the Premier League, I am disappointed when he did not put everything on the night pitch, he played well, but for the second goal scored wolves, it never followed his opponent ... winger Adam is that we have in the team.
"He can not play games, it's impossible, but if he wants to improve, it could be a lot of chances to play."
Wolves manager Mick McCarthy had the consolation of their performance, saying. "It was an absolute lesson in finishing, but I was happy with our performance.
"It sounds crazy when you come to be beaten by five, but I was happy.
"We started well and deserved the lead. The fact that we do not stick to the head had nothing to do with bad defense. They [the city] are all the best players. Do not try to work more than were tonight, that's for sure. "
PA Sport
He said: "Sometimes, he thinks," Well, in this game, I scored a goal, I support is enough. "I think Adam because he is young, can improve a lot. He needs to think differently."
He added: "He has to think," he noted that the goal, I collected a pass, I go because I want to score another goal and an assist, and return to defend. "
"He can do if they wish. I think it is, it has everything to become one of the best wings."
Mancini added: "Adam is young, he is in his third season in the Premier League, I am disappointed when he did not put everything on the night pitch, he played well, but for the second goal scored wolves, it never followed his opponent ... winger Adam is that we have in the team.
"He can not play games, it's impossible, but if he wants to improve, it could be a lot of chances to play."
Wolves manager Mick McCarthy had the consolation of their performance, saying. "It was an absolute lesson in finishing, but I was happy with our performance.
"It sounds crazy when you come to be beaten by five, but I was happy.
"We started well and deserved the lead. The fact that we do not stick to the head had nothing to do with bad defense. They [the city] are all the best players. Do not try to work more than were tonight, that's for sure. "
PA Sport
