Having already won the Premier League and FA Cup, Pep Guardiola's side are on course to win the treble this season.
Walker missed the Champions League group stage through injury but played a key role in their knockout stage victories en route to the final. The right-back plays a pivotal role in the City defence and will likely be a key player should he make an appearance against Inter.
Guardiola revealed Walker sat out training on Tuesday with a 'disturbance' in his back, however, the player insists he'll be available for Saturday's showpiece.
"I'm fine, I'm just getting old," he told Sky Sports News. "I'm completely fine, it's just an extra day of recovery.
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"I've played a lot of minutes over the last number of weeks so the manager said, 'Just stay inside and come Saturday you will be raring to go'.
"I'm fine, the minutes that I've played when everyone else was injured, I was there digging my heels in and getting through it. I won't be missing the Champions League final for anything."
City have progressed through this season's Champions League unbeaten and conceded just five goals.
This will be their second appearance in the final after their heartbreak in 2021 when they lost to Chelsea.
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Walker started and played the full 90 minutes in the defeat, with he and his fellow City stars keen to make it second time lucky.
Victory against Inter would signal the club's most successful season in their history and see them finally claim the coveted European crown.
Guardiola has already won the Champions League twice, doing so with Barcelona in 2009 and 2011, and will become only the third manager to lift it three times should City emerge victorious.
talkSPORT will have live coverage of the Champions League final between Man City and Inter Milan on Saturday night.