Portsmouth are unlikely to delve into the market, but have the option of signing free agents outside the window should they require any additional depth or cover.
But which players are available as free agents? We take a look at some of the exciting options that Kenny Jackett could yet pursue should he wish to seek new recruits:
1. ALAN SHEEHAN
Released by Luton Town on deadline day, Sheehan has a wealth of League One experience and helped the Hatters to promotion last season. | Getty Images Photo: Alex Livesey
2. TOM CARROLL
Big things were once expected of the former Tottenham Hotspur midfielder, but he now finds his career at a crucial juncture after being released by Swansea City. A move to League One to rebuild his career could prove attractive. | Getty Images Photo: Stu Forster
3. EFE AMBROSE
If Portsmouth need experience at the back, they need look no further than Ambrose - whose spells with Hibernian, Celtic and Derby County saw him make over 250 appearances. He’s got international experience with Nigeria, too. | Getty Images Photo: Ian Walton
4. BEN MARSHALL
The exciting winger has been attracting interest from Rotherham United and Bolton Wanderers in recent months, but is yet to find a new club after leaving Norwich City. He would surely have plenty to offer in League One. | Getty Images Photo: Michael Steele