The summer transfer window is now done and dusted, but second-tier sides are still able to snap up players who are currently out of contract, and there's a number of intriguing options still out there on the hunt for a new club.
From former England internationals to injury-plagued players looking for a fresh start, the free agent market is a varied, often risky business to be involved in. However, if a club strikes lucky, they can find themselves reaping the rewards when their new signing defies the odds and revives their career.
Here's a look at 15 free agents that Peterborough United and all their divisional rivals could look to bring in - some more realistic than others, granted - now that the transfer window has closed:

5. Hal Robson-Kanu - AM/ST
The 32-year-old featured frequently for West Brom in the Premier League last season - he scored a lovely goal against Liverpool - and still has enough in the tank to bang in some Championship goals. Photo: Catherine Ivill

6. Salomon Kalou - ST
We saw ex-Chelsea ace John Obi Mikel play for Middlesbrough and Stoke City later on his career, so why shouldn't Kalou have a crack at the Championship? That said, he's probably going to join Portuguese side Os Belenenses instead. Photo: CHRISTOF STACHE

7. Adrian Mariappa - CB
He's currently a free agent, but is still involved in World Cup 2022 qualifying with Jamaica. With over 220 Championship appearances, the 34-year-old knows the division well, and spent last season with Bristol City. Photo: CHANDAN KHANNA

8. Melvin Sitti - CM
He had his contract with Norwich City terminated by mutual consent last week, but the 21-year-old could yet land himself a deal at an English club. He never managed to break into the Norwich side, but could impress if given a fresh start. Photo: Stephen Pond

