Can we add warnings when someone is going to ban your champ already?

It pretty much never fails that every few games, there will be an oversightful summoner who doesn't look at the team's pick intents and bans one of the intended champions. This has happened to me and many other players on numerous occasions.

There needs to be some sort of warning to let players know they're going to ban a teammate's champion or something, because it's getting tiresome.