
The Argentina international has scored just once this season and he feels his form has been affected because of the work he has to do for the team in a highly-competitive Premier League.
"I'm not as dangerous. I'm not as effective in the penalty area any more," he said.
"That is something I have lost and I have to get that back. I used to score better goals, great goals.
"But something strange has happened. I think it has to do with the fact that the person up front has to do a lot more for the team than just score goals.
"They have to play more for the team and I think I have sacrificed myself recently with regards to that aspect."

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