Bale featured as a second-half substitute and was influential in the 6-1 rout.
"It was great to be back in the Champions League," he said.
"It was great being involved in the last three goals of the team.
"I had no preseason and I could not play during the summer. Now the aim is to reach my top form as quickly as possible. I have to keep working hard in training and in games."
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