We're just a year removed from one of the worst times in Johnny Sexton's career. Taking a mandatory four month break from rugby after suffering four concussions in just a year, Sexton took a while to get back to top form.
There is always a concern when players go down from head injuries, especially when someone takes a number of knocks. But there aren't too many players who you'd worry about more than Sexton given his history.
Which is why it's worrying that Sexton was been forced from the field early in the game against Wasps. Sexton failed the HIA test from the first half, but did appear lucid when he joined the team on the sidelines before the end of the first half:
Johnny Sexton failed the concussion test. Not good news. Not good news at all. #WASvLEIN
— Balls.ie (@ballsdotie) January 23, 2016
The positives is that it's Sexton's first head issue since that break, but that's trying to find gold in a pile of bad news.
Unless it really was Leinster's physio taking a lot of precautions over Sexton, which you wouldn't blame him, it now seems likely that Paddy Jackson will start for Ireland against Wales in two weeks.