As noted, Daniel Bryan was sent home from WWE’s current European tour, and WWE issued a statement noting they sent Bryan home as a precautionary measure.
According to F4WOnline.com, Bryan suffered a concussion at some point during his match against Sheamus last week, and officials were at least aware Bryan was banged up after the bout as he hasn’t wrestled a singles match since.
If WWE officials knew at the time that Bryan was concussed, he wouldn’t have competed in matches at all following the injury, so it’s likely Bryan was not officially diagnosed with the concussion until after this week’s Smackdown tapings, at which time WWE decided to pull him from the tour.