The Reds are one of six English clubs - and 12 across Europe - to have signed up for the new European competition.
Milner was speaking after a 1-1 draw with Leeds United on Monday, which saw fans protesting about the Super League outside Elland Road.
Asked about his view of the European Super League, Milner said: "I can only give my personal opinion and I don't like it one bit and hopefully it doesn't happen.
"It [the current system] has worked well for a long time, what has made it special what we have done over the last few years is we have earned the right to win the Champions League and earned the right to win the Premier League. The product we have currently is very good.
"It is difficult. Coming into the game today Leeds fans were making their feelings shown. As players we don't really have a say so it feels a bit unjust. All we can do is try and win football matches."
When quizzed about the Leeds result, Milner admitted fatigue was a factor.
"You have to put in two good halves ands we didn't do that," said Milner. "In the second half we looked tired, probably the Madrid game took a lot out of us.
"For us we are trying to concentrate on the game. There is a lot going on but we have to be professional. We heard first when it broke yesterday."