Kings general manager Dean Lombardi said the injury was not a head injury but will sideline Doughty for 7-10 days.
On the game's first shift, Doughty was hit hard by Flyers rookie forward Zac Rinaldo while skating through the Philadelphia zone. The hit occurred just 24 seconds into the game, and precipitated a fight between Rinaldo and the Kings' Dustin Penner.
Doughty left the ice under his own power, but played just one more shift totaling 1:10 the remainder of the period. He left the bench during the period.
He entered the game fourth in the League in average ice time per game at 27:33 in three games.
I'm very excited about what happened today. We've worked on this deal with Toronto for a month, or over a month. It got a little bit of legs on draft day, but it really heated up last night, and we were able to complete the deal today.
— Penguins GM Jim Rutherford on Phil Kessel, who he acquired from the Maple Leafs in a trade on Wednesday