While goals have been an issue for the Blues for much of the season, the likes of Raheem Sterling and Cole Palmer hitting form have eased those fears with the defence now Pochettino's big worry.
However, Nkunku being fit and available after injuring his knee in pre-season would prove a huge boost for Chelsea.
The £52million summer signing has been nearing a return to fitness for some time and narrowly missed out on the trip to Newcastle.
Chelsea underway in training ahead of their fixture against Brighton! 🔵
Could Nkunku and Lavia feature? 👀 pic.twitter.com/WSYNCSkQqq
— Sky Sports Premier League (@SkySportsPL) December 1, 2023
Pochettino has updated fans after Nkunku was spotted in the team warm-up for training by Sky Sports, with the full session then taking place once the TV cameras were switched off.
A club statement said the Frenchman continues to "progress with the reconditioning phase of his rehabilitation", suggesting he will not play on the weekend.
However Pochettino said a late fitness test will determine whether Nkunku will be available.
Romeo Lavia is also in a race against the clock while he too awaits his long-awaited debut for Chelsea.
Ben Chilwell and Wesley Fofana are among the long-term absentees while Malo Gusto is out.
The right-back's return could come at a crucial time with both Reece James and Marc Cucurella suspended for the game against Brighton.