The Wales captain has netted three times this season from midfield but, by his own admission, has lacked composure inside the penalty area in recent games.
"He always looks like he will score but doesn't score at the moment. Once that will be done I think he will be more relaxed in front of goal and score more. He has played many games this year and for a first season that is tremendous.
"I am quite happy I can give him a breather sometimes now. Aaron has played many games but he did absorb them well. He was tired two or three weeks ago, and it allowed me to give a breather [on Wednesday] to Tomas Rosicky who has played many games recently."