Dzeko has now scored six goals in nine Premier League matches for City this season despite making only three starts.
Platt believes that Dzeko could walk into the starting line-up of most teams in the English top flight but admitted that Roberto Mancini was spoilt for choice in attack.
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"That's the way that it's been at this football club, since I have been here anyway. It's the way that it is at everybody's football club.
"We've got a lot of players that would play in almost any Premier League team and we can only pick 11 of them. Edin's one of those players that can either start a game or be a substitute. He can either come off the bench or not come off the bench."
Platt was also keen to emphasise that Dzeko's freshness in the latter stages made him a real weapon for Mancini to be able to call upon.
"We felt that we needed an injection, just a bit more height to maybe get a platform and hold the ball up, but we also know that he's a goal threat and he's fresh and he's scored lots of goals this season and since he's been here as well for the last 18 months when he came here in January," Platt added.
"He's got some heavy goals is what I said after West Brom and I will continue to say it. He's a valued member of our squad of which we rotate but, as I say, we can only put 11 on the pitch."