Karim Benzema reacted angrily to questions over his work ethic at Real Madrid after Carlo Ancelotti admitted he was concerned about his attitude.
The French striker has been given a tough time by Real Madrid fans at the Bernabeu this season.
He was booed off after being substituted in a game against Athletic Bilbao last month and Ancelotti hinted that Benzema could benefit by working harder.
He has also come in for some criticism for the national team after scoring just one goal in 16 months and was recently dropped in favour of Arsenal's Olivier Giroud.
But Benzema insists the negativity is unjust, telling reporters: "What attitude? Carlo Ancelotti did not say (that I was not working enough). He said that me and Angel Di Maria did not have the same share of defensive work.
"I'm a frontman. Of course I'm the first defender but I won't do the job of a full back or a midfield," he said.
"It's not a question of attitude. You talk about attitude when a player does not want to play football. But I walk on to the pitch, I want to play football.
"For example, when I play for France... I run almost 10 kilometres per game. It's unfair because I do run."
His supposed lack of effort for Real Madrid has seen him linked with a January exit with both Chelsea and Arsenal interested.
Arsene Wenger has been looking to add to his attack having failed to sign Chelsea striker Demba Ba on transfer deadline day.
Jose Mourinho looks to be Wenger's main rival in the battle for his signature with Mourinho looking to replace his faltering strikers Ba, Samuel Eto'o and Fernando Torres who are yet to score any goals between them so far this season.