Striker Daniel Sturridge, who has scored nine goals in the league this season, has been ruled out for up to eight weeks with a sprained ankle.
Playmaker Philippe Coutinho is fit again after only being a substitute on Sunday's defeat at Hull and when key players go down Rodgers knows he does not have the necessary replacements.
It means he will have to add again in January in order to give his side the best chance of maintaining their push to regain Champions League status.
"I think every window for us will be exactly the same - if there's a player we think can improve our squad and in particular the team, I'm sure we will be able to go out and get that player," he said.
"It was always going to be the case that if we had a few injuries to key players, that leaves us light.
"It's no different to a lot of squads, but for us it's even more prominent because Daniel Sturridge and young Coutinho were not playing and they are good players."
Rodgers believes his players owe the fans a performance against Norwich on Wednesday after the dismal display at the KC Stadium at the weekend.
He believes playing at Anfield, where they have lost only two times in 2013, provides the ideal opportunity.
"It's where we love to play and the earlier we can score a goal, the better for us, because it gives us that confidence to go on and take the initiative in the game," he said.
"We want to put it right for the supporters as well, because they were hugely disappointed after the game against Hull.
"For us, they've been magnificent and they've given us great backing and great support and we disappointed them.
"So we've got two games now to make that right, starting against Norwich (followed by West Ham).
"We had set ourselves some targets over the course of five games and these are the final two in that little block of targets."