It’s time for us to dispel a myth that’s gotten out there, namely that Lionel Messi has only three UEFA Champions League medals because he, for whatever reason, did not get one in 2006.
It really started when the UEFA website itself posted, in error, that Messi has won the Champions League three times. From there, it was reposted by many other sites.
The UEFA website has repeatedly said Messi has four Champions League medals, but they said it one time it was three by mistake.
You can find links to UEFA’s website confirming Messi has a 2006 winner’s medal here, here, here, here, here, here, here, and probably elsewhere, those are just examples.