Cricket Australia announced on Thursday that Saker would leave the post he held for three years effective immediately.
Coach Justin Langer said the decision was the culmination of nine months’ discussion, plus the unprecedented away schedule on the horizon.
However, foxsports.com.au understands the pair didn’t see eye-to-eye on a variety of matters and Saker’s exit was inevitable by the end of the Test summer, as revealed by Fox Cricket’s Tom Morris.
Even so, off-spinner Lyon told reporters on Friday he was shocked and “disappointed” by Saker’s decision and gave Langer’s parting assistant his vote of confidence.
“I know he’s got my support, but I’m not part of those conversations behind closed doors to be honest, so it took me by surprise,” Lyon said.
“I was taken back by it to be honest, I didn’t really catch on to anything especially in Canberra after a great Test win down there – I didn’t really think anything of it. He didn’t mention anything to me.
“He’s been great for me, he’s been a massive support so he will be missed that’s for sure.”
Langer said in a statement on Thursday he reached a mutual agreement with Saker that it was time for the pair to part ways before preparations for the World Cup and Ashes intensify.
“David and I have had ongoing discussions over the past nine months about his role with the team, and we agreed it’s the right time to head in a different direction in the best interests of the team,” he said.
Saker served for three years and will now be replaced by National Performance Squad head coach Troy Cooley.
Lyon added that his focus is now on moving on, and ensuring Australia’s attack develops their bowling plans ahead of a blockbuster winter that includes World Cup and Ashes campaigns back-to-back.