Mason’s campaign has been plagued with injury problems, with the forward still struggling for fitness.
The former Cardiff City man has not been seen since January, after his latest injury issue.
And Lambert said: “Joe’s doing all right. He’s had a really frustrating season, stop-start, stop-start.
“He’s got to have a season where he’s sustainable for 39, 40 games.
“Most players have to have that in their make-up. You can see he’s got great ability, it’s just keeping him fit to perform.”
Mason is expected to be fit again before the end of the season, with Wolves having four games left to play.
Whether the 25-year-old will be given a chance by Lambert remains to be seen, though.
Mason has shown flashes of promise at Wolves, but he has not scored with any regularity.
Mason has scored just four goals in all competitions this season, although many of his appearances have been as a substitute.
Wolves’ next match comes against Blackburn Rovers at Molineux on Saturday.