Majewski, 23, has spent the season on loan at the City Ground and will make the move permanent this summer.
Cardiff City have been given a further 42 days to pay their $1.9million debt to HM Revenue and Customs, as they try to finalise investment from Malaysian businessman Datuk Chan Tien Ghee.
Derby County have released Jay McEveley and Gary Teale as manager Nigel Clough rebuilds his squad for next season.
Huw Jenkins, the Swansea City chairman, has played down speculation that manager Paulo Sousa's position at the club could be at risk.
The Swans missed out on the Championship play-offs after a late-season slump, but Jenkins is confident that Sousa will remain in charge at the Liberty Stadium.
"I can't really comment on what Paulo said because I wasn't there, but this is a general board meeting and it was not called to discuss Paulo's future," he told Wales Online.
"He has got two years remaining on his contract and that's the situation with Paulo. We have to discuss how the season went and what we should do next season - as we always do."
Midfielder Joey Gudjonsson has left Burnley, relegated to the Championship this summer, by mutual consent.
He only made one appearance for the Clarets this season, and any chance of a return to first-team football ended when he criticised manager Brian Laws before the 4-1 win at Hull City last month.
Sheffield Wednesday have offered new contracts to Richard O'Donnell and Arron Jameson, but released six players following their relegation to League One.
Francis Jeffers, Leon Clarke, Frank Simek, Sean McAllister, Etienne Esajas and Michael Gray are all on their way out of Hillsborough.