Pochettino hasn't got the right mix of players in his squad. Chelsea are still struggling in their first two matches. even against West Ham, Chelsea conceded 3 goals.
Pochettino made Chelsea's game more interesting in midfield. but there are no good options up front. balls that are passed forward are always raw and only result in non-goal opportunities.
maybe news regarding them having to include Lukaku in the team could be a good option for Pochettino. I'm sure he knows exactly what his team is lacking at the moment.
I have heard that Lukaku is doing training with U21 team now. It is said that he hasn't even communicated with Pochettino on his future as well. If this is really true then there is no way Lukaku is returning to the main squad from now on. He is clearly not wanted there and I hope they can find a team for him as soon as possible.
It would be better if they manage to send him on a permanent deal to a team. It was nearly happening between Chelsea and Juventus a little while ago. But there wasn't an agreement on cash while they were trying to agree on a cash plus player deal. Maybe Saudi Arabia would be the best for him indeed.