The duo have struggled to break into the team in recent weeks and the Norwegian is prepared to listen to offers.
He told the Express & Star: "If the right offer comes in for Ronald, it's a possibility that we won't stand in the way.
"He wants regular first-team games and he deserves that. His attitude has been fine - he's been smiling and working hard.
"And if the right deal for him comes along, we will let Eggert go permanently.
"I think they paid £500,000 or something for him but you'll have to ask Jez Moxey what they want."
Defender Zubar has made 66 appearances for Wolves since joining in 2009, but has not played since October.
Jonsson returned from a loan spell with Charlton at the beginning of December but has not featured since his return.
The Iceland international has made just seven appearances since joining from hearts in January.