The former Celtic striker hit a brace in the Capital One Cup in midweek.
"Gary is a good striker but we have other good strikers as well with Ricky and Johan Elmander, but we have to give the ball to them to score," said Fer.
"It is difficult for them to do everything for the team but if we can feed them the ball much more, they will definitely score for us. As a midfielder, you have to put the ball in to the strikers to allow them to score."
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