Carlos Carvalhal has urged England striker Tammy Abraham to learn from Cristiano Ronaldo if he wants to flourish at the top level.
Abraham has had a roller-coaster campaign at Swansea since joining on loan from Chelsea.
The 20-year-old scored five goals in the opening two months of the season and won his first England caps against Germany and Brazil in November.
But Abraham has not scored since Oct. 14 and subsequently lost his Swansea place, with his last Premier League start coming on Dec. 30.
"I have spoken with him and he knows exactly what he must do to be part of the team and a more complete player,'' Swansea manager Carvalhal said, confirming that Abraham would start Tuesday's FA Cup fourth-round replay at home to Notts County.
"He has a challenge in hand to show he is progressing in the main points I have talked about with him, and I am curious to see the reaction.
"If he does what we want he will be a better player, so let's see what happens. We believe we can progress him as a player.''
Carvalhal managed Sporting, Ronaldo's first club, during the 2009-10 season and said his fellow Portuguese's legacy was plain to see in Lisbon.
And Carvalhal suggested that Abraham should copy Ronaldo's attitude to the game, an approach that has seen the Real Madrid star win the Ballon d'Or five times.
"When a boy has the talent to be a top player there is one path to take, and if they have principles and dedication they achieve a top level,'' Carvalhal said.
"I know in a lot of cases there have been players with a lot of talent at 19, 20 or 21 years old who have promised a lot, but lose the path and never become big players.
"Some of them had more talent than the big players of the world.
"Look at Cristiano Ronaldo. You can see him now at 32, but at 21 or 22 you never saw him involved in a fight at a discotheque, or with problems.
"This is very difficult as you win a lot of money at 20, 21, 22 years old. You are rich, but he continues to be the same guy, with the same work and attitude and it is down to the principles of the family and club.
"Other guys in the same situation lose that path. They want to enjoy the life, the nightlife and they lose their way.
"All these things come down to who you are and what you have in your head.''
On Abraham's meteoric rise into the England squad, Carvalhal added: "You must do good things over a long time, not just one game or five games.
"It is not hard to do that, it is difficult to do it all the time and this is the challenge for Abraham.
"I expect a reaction from him, and on Wednesday I will sit with him and see if he is doing what we want.
"If he is, then fantastic, if not we will work with him to follow what we want.''