Posh revealed that goalkeeper Jed Steer had signed a contract until the end of the season.
Bizarrely, it was the second time the League One club announced the signing of Steer during the January transfer window.
At the start of the month, Peterborough had signed him as cover Nicholas Bilokapic while he was in the treatment room.
He played four times for them before the club then announced on January 29 that he would be leaving them.
Darren Ferguson had revealed that it was because he could not guarantee Steer playing time.
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He said: "Jed came to see me this morning and said he wanted to go. I understood his reasons, I was a bit disappointed, not with him, just in general because I think he has done very well for us.
"He doesn't want to risk not being guaranteed playing every week."
However, there has been a U-turn and Posh announced on February 1, on deadline day, that Steer had in fact signed for the rest of the season.
The 31-year-old has played for the likes of Aston Villa, Yeovil, Cambridge, Doncaster, Charlton, Huddersfield and Luton before signing for Peterborough.