Although the window is shut until January, clubs can still enter the free agent market should they feel the need to strengthen before then.
Scroll and click through the pages as we pick out 15 free agents who could interest Newcastle United and fellow Premier League clubs:
1. Fabio Borini
Borini has played his football in Italy for the last three seasons at AC Milan and Hellas Verona, respectively. He is still only 29 as he continues his search for a new club. A return to Swansea City has been rumoured… Photo: Marco Luzzani
2. Alexandre Pato
The Brazilian hasn’t quite fulfilled the promise he showed as a youngster at AC Milan having just been released by Sao Paulo. His previous spell in the Premier League with Chelsea was one to forget - a perfect opportunity to redeem himself? Photo: Miguel Schincariol
3. Ezequiel Schelotto
The full-back was released by Brighton and Hove Albion in July and has been linked with staying in the Premier League with Crystal Palace or Watford. That said, interest has also emerged from across Europe. Photo: Mike Hewitt
4. Cuco Martina
Martina, 31, featured for Southampton and Everton in the Premier League before being shipped out to Stoke City and Feyenoord last season. Photo: Michael Regan