Everton manager David Moyes is confident Jo will be fit for the start of the Premier League season after the striker limped off in Tuesday night's friendly defeat at Blackpool.
The Brazilian, on a season-long loan from Manchester City, scored the equaliser before injuring his ankle and leaving Bloomfield Road on crutches.
Moyes, however, has played down the seriousness of the injury.
"I think he's just rolled his ankle. I don't think it's too bad," he said. "Hopefully he'll be all right, and it wasn't too serious."
Lescott and Pienaar could be in line for a return against Malaga at Goodison Park on Friday.
"In Salt Lake City Joleon jarred his hip just after half-time. He's okay, but it's a bit sore," head physio Mick Rathbone told evertonTV.
"He's making progress, and we hope to have him back sooner rather than later.
"Steven got a minor thigh strain [against River Plate in the first game of their US tour].
"He's been running okay and again we're looking at the Malaga game, hopefully, for him."