There are LOADS of players on Football Manager that are better suited to a different role on the pitch, be that due to attributes, PPM's, or general effectiveness.
Just Because a Player is say a DEFENSIVE MIDFIELDER that doesn't mean he will be useless everywhere else.
Lets take Efrain Juarez for example. He's a mexican defensive midfielder who plays for Celtic.
His stats are fairly balanced, with a greater emphasis on Mental and Physical. He looks like a great DM, and he is. His Pace gives him a real edge on attackers. I've selected Juarez as he's one of my favourite conversions. I tend to convert him from a Defensive Mid to an Attacking one. This idea came from his PPM to 'Get Forward Whenever Possible' and when I managed Celtic this reduced his effectiveness as a DM but he came to the fore in my season when played as a Central Mid set to Attack. His Pace and Mental attributes helped this too, he ended with 15 goals to his name.
I set him to train on his finishing and as an ATTACKING MIDFIELDER, He became amazing. Voted Both Players' Player of the Year and SPL Player of the year for 3 years.
I also Taught him the PPM's: Dictates Tempo, Plays One Two's and Runs with Ball Often (Mainly due to his Pace)
Many Players can be loads more effective in different positions, Just Be sure to Teach the right PPM's and train on there weak points
Other one's worth Converting are:
Eden Hazard to a Left Winger
Neymar to a Left Winger
Wayne Rooney to an Attacking Midfielder
John Obi Mikel to an Attacking Midfielder
Jan Chramosta to a Winger
Douglas Costa to a Winger
Rafael Van Der Vaart to a Striker
Robin Van Persie to a Central Midfielder
Thomas Muller to a Striker
Carlos Tevez to a Winger/Central Midfielder
Just Because a Player is say a DEFENSIVE MIDFIELDER that doesn't mean he will be useless everywhere else.
Lets take Efrain Juarez for example. He's a mexican defensive midfielder who plays for Celtic.
His stats are fairly balanced, with a greater emphasis on Mental and Physical. He looks like a great DM, and he is. His Pace gives him a real edge on attackers. I've selected Juarez as he's one of my favourite conversions. I tend to convert him from a Defensive Mid to an Attacking one. This idea came from his PPM to 'Get Forward Whenever Possible' and when I managed Celtic this reduced his effectiveness as a DM but he came to the fore in my season when played as a Central Mid set to Attack. His Pace and Mental attributes helped this too, he ended with 15 goals to his name.
I set him to train on his finishing and as an ATTACKING MIDFIELDER, He became amazing. Voted Both Players' Player of the Year and SPL Player of the year for 3 years.
I also Taught him the PPM's: Dictates Tempo, Plays One Two's and Runs with Ball Often (Mainly due to his Pace)
Many Players can be loads more effective in different positions, Just Be sure to Teach the right PPM's and train on there weak points

Other one's worth Converting are:
Eden Hazard to a Left Winger
Neymar to a Left Winger
Wayne Rooney to an Attacking Midfielder
John Obi Mikel to an Attacking Midfielder
Jan Chramosta to a Winger
Douglas Costa to a Winger
Rafael Van Der Vaart to a Striker
Robin Van Persie to a Central Midfielder
Thomas Muller to a Striker
Carlos Tevez to a Winger/Central Midfielder