Murray took to Twitter on Monday to release a statement declaring his intentions and stated he was “fully committing” his time to “becoming an NFL quarterback”.
The 21-year-old made the decision four days before he was expected to report to baseball spring training for the A’s.
And following Murray’s announcement, Oakland’s boss Bob Melvin revealed it wasn’t “a shock” to hear of his decision.
“We still have the rights to him,” Melvin said.
“But it looks to me he is going to have a nice little football career.
“We are going to be rooting for him.”
Murray did not refer to baseball or Oakland in his statement, but his choice will see him walk away from over $4.5million.
According to ESPN’s Jeff Passan, the 2018 Heisman Trophy winner will return $1.29m of the $1.5m signing bonus he received from the A’s last year.
And Murray will also forfeit the remaining $3.16m of the deal, which would have been paid on March 1.
Oakland are expected to put him on the restricted list and will retain Murray’s rights.
Before Murray made the announcement Oakland’s executive vice president of baseball operations Billy Beane said the A’s might lose the player.
“Things have certainly changed since the draft,” Beane said.
“The situation is fluid right now and based on a historic college football season that the young man had.”
Murray began his statement by confirming his commitment to the NFL.
“Moving forward, I am firmly and fully committing my life and time to becoming an NFL quarterback,” he said.
“Football has been my love and passion my entire life.
“I was raised to play QB, and I very much look forward to dedicating 100% of myself to being the best QB possible and winning NFL championships.
“I have started an extensive training program to further prepare myself for upcoming NFL workouts and interviews.
“I eagerly await the opportunity to continue to prove to NFL decision makers that I am the franchise QB in this draft.”
Where Murray is expected to go in the 2019 NFL Draft has caused some disagreement among experts.
Few question the athletic abilities of the youngster, but at a reported 5’10” his height is a concern for many.
Mel Kiper and Todd McShay, ESPN’s draft experts, both think Murray will go as a first-round pick.
“He’s unbelievably athletic and one of the best dual-threat quarterbacks I’ve ever seen,” Kiper said.
“He can make every throw, and he does it with timing, touch and poise. He could be a really good NFL quarterback.”
In his latest mock draft, McShay has Murray going to the Miami Dolphins as the No 13 overall pick.
“Yes, the risk is apparent — Murray is undersized at 5-foot-10 and still hasn’t decided on his baseball career,” McShay wrote.
“But he has an electric arm and some of the best athleticism I’ve seen at the position in years.”
However, ESPN commentator Stephen A. Smith believes Murray isn’t a first round pick.
“Now I don’t want to hear about him being 5’10”, he looks like 5’8” okay,” Smith said.
“He is a tiny dude, him throwing in the pocket is a problem.
“I am not taking him as the No 1 overall pick.”
The 2019 NFL Draft begins on Thursday 25th April and ends on Saturday 27th April.