The trio have not featured in either of Boro’s pre-season matches so far, and are not due to return to action until after the Teessiders have kicked off the new Championship campaign with a home game against Swansea City on August 9.
Edmundson suffered a calf injury on the first day of pre-season training and is expected to need at least another fortnight on the sidelines.
Azaz, who was part of the first-team group that travelled to Portugal for a training camp, has also suffered a muscular injury, and is not expected to return to full training until the latter half of next month.
“George was a really disappointing one,” said Boro head coach Rob Edwards, whose side return to pre-season action tomorrow when they take on Rangers at Ibrox. “It was the very first day when he felt his calf. Day one. He’ll be a couple more weeks, I would have thought at the moment.
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“Finn had a tightness in his quad. It was scanned, and he’s probably going to be around three weeks as well. That’s where he’s at.
“It’s really frustrating because he was looking brilliant in the early days – really motivated and looking really good. He’s a naturally fit boy, so we’re hoping that we get him back quickly and he doesn’t require too much getting up to speed.”
Dieng has been sidelined since rupturing his Achilles in December, and while he has recovered successfully from the surgery that was required to repair the damage, he continues to gradually build up his fitness.
He has been able to take part in some light training in the last couple of weeks, but remains at least a month away from being back up to full speed. As a result, Boro will head into the new season with Tom Glover and Sol Brynn as their two senior goalkeeping options.
“Seny has been out on the grass, but it’s been very light training at the moment,” said Edwards. “It’s the very early stages of continuing his rehab. He won’t make the start of the season or anything like that.
“He’s doing very well and working incredibly hard. He’s a real positive guy, but I still think he’s got a little way to go at the moment.”
