But Johnson, who saw the striker bag the winner in the midweek triumph over Crystal Palace, will speak to Wolves counterpart Mick McCarthy regarding an extension to the 31-year-old's deal.
"I'm in dialogue with Mick McCarthy, let's say that," Johnson told the club's official website. "Chris' loan deal doesn't end until after the Reading game anyway.
"We've had a chat about a few variables and I'm happy with that. We've promised to speak to each other again on Sunday morning.
"We really can't discuss anything more until after the Reading game."