The 35-year-old deputised at right-back against Crystal Palace for yesterday's 3-0 win after Alexander-Arnold was forced out due to illness.
Milner was asked post-match how he found out he'd be up against Ivory Coast international Zaha.
"Trent's definitely going to get some ribbing for that," he told the club website. "A bit of Zaha-itis or something like that!"
"It was probably three, two-and-a-half hours before the game really. But that's what we're prepared for and the training is done so anyone is ready at any time. That's my job when I'm needed."
Milner continued: "We're getting into that period now where you have a game every three days and the manager will change a lot.
"It's tricky but it's tricky for everyone. We're used to it now but hopefully we can keep this momentum going and keep churning out the results."
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