Cape Town - Monaco manager Leonardo Jardim believes Radamel Falcao harmed his career by going on loan to Manchester United and Chelsea.
The Colombia international signed for Monaco in 2013 in a £51m move, but suffered a serious knee injury in his first season at the club.
The 30-year-old went out on loan to Manchester United the next season, followed by another loan deal at Chelsea.
He flattered to deceive at both Premier League outfits and is back at Monaco. Jardim believes the time in England did the striker more harm than good.
"The problem with Falcao is not only his knee injury, it is also the fact that he left to play two seasons in Manchester and Chelsea," Jardim said as quoted by The Express.
"He tried to keep playing at a high level when normally when you have an injury like this, you stay in your club to try to come back faster.
"When a player is injured, normally they do not change club. It's not easy to recover and play along. Players are not machines."
Commenting on the loan spells, Jardim added: "I do not know if it was a mistake, but it did not work well. He did not play, but it is not a problem of quality because he remains one of the best strikers.
"He has not changed. He's only 30 years old. Here our aim is to help him back to his level."