Toure will face his former club as City bid to overturn a two-goal first-leg deficit from their Champions League last-16 clash.
"If I score in the second leg of the Champions League I will not celebrate out of respect," 30-year-old Toure said.
"The people of Barcelona supported me in my career as a Barca player and I could not celebrate a goal in Camp Nou. I am very grateful to the fans.
"There was disappointment in the team after losing to Barcelona. It is normal, but a winner must always think of the positives.
"If the opponent plays better I must say. Barcelona were better than us in the first leg win and it is normal."
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