Both Celtic and Rangers have been active in the window thus far with the Parkhead side spending £16m in recruiting Kyogo Furuhashi, Carl Starfelt, Liam Scales, Liel Abada, Josip Juranovic and Joe Hart, while landing James McCarthy, Osaze Urhoghide and Liam Shaw on free transfers.
The Hoops recouped most of that outlay in the £13.5 received for the sale of Kristoffer Ajer to Brentford, and there are likely to be more arrivals and departures at Celtic Park throughout the rest of the day in the lead up to the midnight deadline.
Rangers are expected to be less active with no such need for a radical overhaul having already added Fashion Sakala, John Lundstram, Juninho Bacuna and Nnamdi Ofoborh to last season’s title-winning squad, but a big-name departure cannot be ruled out due to the need to balance the books following the failure to qualify for the Champions League.
Here are some of the deals that could take place at Celtic Park and Ibrox on transfer deadline day:
5. Rangers: Borna Barisic - OUT
The Croatian left back's emotional reaction at the end of Sunday's win over Celtic led to suggestions he may have played his last game for the Ibrox club ahead of an impending move amid links with Roma and Tottenham. One to keep an eye on today. Photo: Alan Harvey - SNS Group
6. Celtic - Ryan Christie OUT
Bournemouth looks the likely destination for the midfielder on deadline day after he rejected a new contract offer with Celtic. A transfer fee around £3m has been mooted with a medical expected today before he jets off to Denmark with Scotland. Photo: Rob Casey - SNS Group
7. Rangers: Nathan Patterson - OUT
The 19-year-old Scotland right-back looks set to stay at Ibrox after Everton had two bids, an initial £5 followed by £8m with add-ons, rejected in the past week. The Toffees are now unlikely to return to the table, but you can never say never on deadline day. Photo: Rob Casey - SNS Group
8. Celtic - Giorgos Giakoumakis IN
The Greece international striker is expected to complete a £2.5 move from Dutch side VVV Venlo on deadline day. The 26-year-old was the top scorer in the Eredivisie last season with 26 goals, despite the club being relegated. Photo: ALKIS KONSTANTINIDIS