The Australian defender was given a hostile reception when the Hammers beat Rovers 2-1 in Lancashire in March and more of the same is likely on his latest Barclays Premier League visit.
Emerton said of his compatriot: "I think Lucas is a very strong character and I don't think he'll let it bother him too much. I'm sure he'll be looking forward to it.
"I think it's a little harsh on Lucas because he was a great servant to the club and gave 110 per cent every time he stepped out on the pitch.
"Hopefully they might give him a little bit more of a warm welcome this time around. He was here for five years. He is a great player and I think he gave a lot to this club so maybe it's a little unfair."