They've got players they already own that would be assets to them, Christensen being the most established of those. If they stick with a WB formation, Baba could prove useful, but I'm fairly skeptical of players bought for the first team who then get loaned out ever being heard from again. They've also got Lewis Baker out on loan and, from what I've read, he's been doing quite well in the Netherlands for just over a year. It also remains to be seen if Chalobah and Ruben Loftus-Cheek can make an impact(highly doubt the latter will).
As far as transfers are concerned, they have no depth on either flank at wing/fullback, so I imagine they'll be looking for reinforcements there. Apparently Conte sees Moses as a viable RWB, so if they stick with 3 at the back, a LWB with skill on the ball like Ricardo Rodriguez who they've been linked to would probably be a good option. If they bring Christensen back and Zouma gets back to fitness, they should be more or less set at CB, as I think Luiz filled the hole left by the failed bids for Koulibaly and Romagnoli financially. Not sure about their central midfield; depends on tactics, how things like the Cesc situation develop and how they rate their homegrown players.