Lukaku continues to train alone at Cobham as a move to Juventus fails to materialise.
Juventus have bid 32million, plus £2m in add-ons, for Lukaku but the offer is conditional on them selling Dusan Vlahovic.
Al-Hilal have a £40m fee agreed with Chelsea but could walk away from a deal if they complete a move for Fulham striker Aleksandar Mitrovic.
Asked whether he could reintegrate Lukaku into the Cheslea squad if he fails to secure a move, Pochettino said: “It is not only one side – it is two sides needed to find the best solution.
“You cannot put it only on the club, it is about both sides. The situation is where it is because of both sides. Both sides have arrived at an agreement.”
Pochettino added: “We were informed before we signed about the situation of every single player. After we signed, we had the squad that we had.
“It is so clear that nothing has changed, and if there is something to inform then we will inform. There is nothing for us to do – I need to be focused on my team to try to perform.
“We cannot spend energy on a situation that was clear before we arrived at Chelsea.”
