"I have played in the AFC Cup for four years out of the past five and have never previously played on an artificial surface," Rehman told ESPN FC.
"It's a regional competition so it should not be allowed."
Pahang's domestic rivals Johor Darul Ta'zim, who edged Rehman's side to the Malaysian Super League title on Saturday, were also in AFC Cup action but could only manage a 1-1 draw at home to Hong Kong outfit South China.
Rehman said tiredness after the title race had also not helped their display in Central Asia.
"It was our eighth game in 25 days and I don't think the astroturf pitch helped us at all," he added.
"It's not safe and is an unfair advantage to the home team, in my opinion."
The second leg in Malaysia will be played on Sept. 16.
(Writing by Patrick Johnston in Singapore; editing by Amlan Chakraborty)
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