RKC Waalwijk were active players on deadline day, as the Dutch club signed Anthony Obodai, Tarik Sektioui, Jan Vertonghen and Erwin Lemmens.
Ghana midfielder Obodai ended an unhappy spell at Sparta by signing a three-and-a-half-year deal with RKC.
Obodai claims he was treated badly by a section of Sparta's players.
"Last season I was chosen as best player (of Sparta), I'm a nice guy and talk with everybody," he told De Telegraaf. "I realised that it happened because I kept Yuri (Rose) from a starting position and Danny (Schenkel), Sjaak (Polak) and Wouter (Gudde) wanted their friend to play."
Sektioui has signed a loan deal at RKC from Porto, much to coach Mark Wotte's delight: "Tarik is quick and skilful and can play on the wing or in the middle."
Vertonghen is another player to have joined on loan, with the teenage midfielder making the move from Ajax. Michael Krohn-Dehli has followed Vertonghen out of Amsterdam as he has joined Sparta on loan.
Belgian goalkeeper Lemmens was the fourth new face, with the 30-year-old making the move from Olympiakos.
RKC have allowed striker Eddy Putter and midfielder Nick van der Velden to join FC Dordrecht.