I mean, he's going to get some stick. Definitely not as much as Sterling, but some. Probably not as much as Torres.
It helps that Liverpool are good. If they were bad, or even just treading water, it would be more. I think Liverpool supporters will be jacked up for that matchup period, Coutinho or no. They'll probably boo/shout at a number of players (minus Suarez).
I don't think they will be on him has much as Sterling or Torres either since in most eyes it was a less sensitive move being outside of England and all. But I was actually more thinking about the players on the pitch. I think it was Agger who didn't give Torres any room to breath in his first return to Anfield. As soon as the ball was near Torres, Agger made sure Torres was down on the ground