The Sweden coach is hopeful that the Paris Saint-Germain star can make the difference and outshine the Real Madrid man
Both the Paris Saint-Germain striker and the Real Madrid forward have been in sublime form in recent weeks and Hamren is hopeful that Ibrahimovic can outclass Ronaldo in the two-legged tie and make the difference for the Scandinavians.
"Of course, it's a fight between these two world-class players," Hamren said at a press conference.
"Zlatan needs support but if he gets that from the team then he can be the match winner. He has been scoring well recently, so that's good.
"However, so has Ronaldo so maybe their form is pretty even.
"All I know is that Zlatan is in really good shape, though. He's feeling strong and that's good for us. Zlatan for me is number one. I say that he is the very best."
Friday's first leg will be played in Lisbon, with the return taking place in Solna on November 19.