Jones hinted that the likes of Sam Simmonds, his third-choice No 8 who started today with Nathan Hughes and Billy Vunipola out injured, might struggle to retain his place in the squad when they regained fitness.
"There's some guys who are starting off their international career and they'll need time," Jones added.
"We've just got to decide whether we've got time to get them ready for the World Cup."
"It's been a little bit complex because we're playing without our five top back-rowers at the moment," Jones said.
"We've lost a number of other players so some guys have come in and done really well, other guys are maybe going to struggle to participate in the future."
But he also maintained his desire to build a bigger squad that could cope with tournaments like the Rugby World Cup, where a winning side has to play seven games over the space of six weeks.
"We have to get a greater depth to our squad, and depth to our squad of players who can play Test rugby," Jones added.