Manchester City striker Sergio Aguero admits communication lines are closing down with Barcelona star Lionel Messi.
Aguero says his close friendship with Messi will go on hold until their Champions League tussle is over.
"It will be an important game for me because I will be playing against my great friend Messi. But the second we step on the field, that friendliness disappears.
"The club has invested a lot of money to reach as high as possible in the Champions League, although we know this will be a very tough game."
