Livermore described his horror at hearing the Hull midfielder had been rushed to hospital on Sunday following a collision with Chelsea's Gary Cahill and said Mason's friends were "praying" for a speedy recovery.
Livermore, who played with Mason at Tottenham and Hull before his move to West Brom, said his friend is bearing up well as Hull yesterday said the player is making "excellent progress".
"I haven't bombarded him with calls but I've kept in touch with the doctor at Hull and a few of the other boys," said Livermore, who left Hull for the Baggies for £10m just two days before Mason was injured. "From what we hear, he's making excellent progress.
Jake Livermore admitted he 'feared the worst' for Ryan Mason after he suffered a fractured skull
"He's a great friend of mine and a great lad and a great player as well. Hopefully that speedy recovery continues. We're all thinking about him that's for sure.
"You fear the worst when something like that happens to any footballer. Being so close and very fresh in the mind makes it worse. I only spoke to him a few days ago and he wished me well here.
"He's in the best hands and has the support of all the fans and everyone in football, that's for sure. It's important he knows that.
"I was back in London with my family and the game was on in the background so I actually missed the incident.
Mason being stretchered off the pitch during Hull's 2-0 defeat to Chelsea
Premier League and Football League clubs send best wishes to Ryan Mason
Mon, January 23, 2017
Premier League and Football League clubs have been quick to send their best wishes to Ryan Mason after the Hull City midfielder suffered a fractured skull against Chelsea
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Football clubs all over the country have sent best wishes to Hull City midfielder Ryan Mason
"It was only when I saw there were nine minutes of injury time that I went back to see what it was.
"Fingers crossed for him. We are all praying for him this end."
A statement released by Hull read: "The club can confirm that Ryan Mason continues to make excellent progress after sustaining a skull fracture in Sunday's game against Chelsea.
"He will continue to be closely monitored by staff at St Mary's Hospital over the next few days, whilst also remaining in contact with our medical team to assess his progress."