With scores 0-0 at half-time, Rodgers introduced Lucas Leiva and Philippe Coutinho before throwing star striker Luis Suarez into the fray a bit later and he admits they were changes basically forced by Johnson's side.
"We needed to have more speed in our game and a bit more intensity. You don't want to do it (making the substitutions) but the last thing I wanted was the game to go to a replay," he said after the win.
"I think you learn as a manager. As you get more experiences you can either wait for it to happen or, if you don't think it's going to happen, you have to change the momentum of the game by making your subs.
"Coutinho came on, Lucas came on and they add that bit of intensity and greater purpose to our play. That allowed us to get better control."
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