The Baggies boss has stated that the centre-back will not leave and that future signings are still possible after the arrivals of Rosenberg, Yacob, El Ghanassy, and Lukaku on loan
The Baggies boss is impressed with the five signings that the club have already made this summer, with Markus Rosenburg joining from Werder Bremen and Romelu Lukaku arriving on loan from Chelsea.
"There has been no indication that Jonas is going to leave us. Over the summer he's worked well, played games and played with his normal 100 per cent commitment," Clarke told the Express and Star.
"He's got a year left on his contract so he's not a free transfer, so as far as we’re concerned Jonas is under contract and will be with us next season.
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"There is nothing that's happened over pre-season to change our mind on that."
The 48-year-old has also revealed that there may be further acquisitions with the start of the new Premier League season just days away.
He added: "Maybe we don't have immediate cover for Liam Ridgewell but Gonzalo Jara and Billy Jones can play at left-back so there is cover in the squad.
"There's perhaps not natural cover in the squad but we do have cover.
"It's important to get the basis of your squad in place. As the transfer window reaches the end of August it will become a little bit frantic.
"And you don’t want to be in a position where you’re making rash decisions without thinking them through.
"So we’ve tried to do business early and build a squad early.
"If the window closed now, I'd be happy with the squad I've got.
"If something came up between now and the end of the window that could improve the squad we would look to do it, but we’re in a position now where we don't have to make rash decisions."