Yeah
gibbs131
... you're a bit wrong here.
It's very obvious during games that we can see Lamela really committing into the pressing philosophy. It's quite easy on the eye to spot him doing that, imo. And if you want a statistic to back some of this, well then Lamela is also ranked fourth in the list of players who are committing fouls (in the PL), which shows that's he's willing to stick a leg in. (Everyone except Chamakh, above him in that list are pretty much dedicated DMs). So yeah, while it doesn't come across perfect for him at all times, Lamela still is trying his best - especially for being an attacking player.
And as for Eriksen, as
Sanchez18
pointed out: There is progress with Eriksen in that aspect. Last season he made only 19 tackles, and this season he already has 9. So yeah, he's learning. Yes, the pressing atm is hampering his attacking a bit, but it's all about a case of adaptability, which I'm sure he will.