The 50-year-old also hailed De Jong's 'big character.'
Newcastle caretaker boss John Carver says Siem de Jong needs two or three more games for the Under-21s before he can return to the first-team fold at St James' Park, according to the Newcastle Evening Chronicle.
De Jong arrived on Tyneside in the summer for a reported £6 million fee, although the Dutchman has barely featured due to injury problems, chiefly a long-term knee issue that arose some months ago.
The 25-year-old, however, has remained a big character within the dressing room, according to current Newcastle boss Carver.
“Siem is one of the big characters in the dressing room but we need him fully fit," Carver is quoted as saying by the Chronicle.
The Newcastle caretaker coach has provided a positive injury update regarding the Dutchman, though, but has warned that De Jong is still some way short of first-team involvement.
“I think he’s got to have two, maybe three Under-21 games and then maybe 45 minutes, 70 and then a full game. He’s still a little bit off at the moment," the 50-year-old explained.
Newcastle are yet to appoint a new full-time manager, with Carver remaining in caretaker charge for the foreseeable future.
Thanks to their FA Cup defeat at Leicester City in the previous round, the Magpies are without a game this weekend, although they resume their Premier League season the following week - away to Hull City.