Vikings running back Dalvin Cook will stick with jersey No. 33 after looking into changing his number to 4, which he wore in high school and college.

“33,” Cook tweeted on Friday, April 23.

A source told the Pioneer Press on Thursday that, following an NFL rules change in allowed uniform numbers, Cook “would love to go back to” No. 4 and was looking at “the inventory costs.” However, a source confirmed Friday it would cost Cook about $1.5 million to make the change, which was considered prohibitive.

NFL rules require that, if a player switches his jersey number, he would have to pay for the existing inventory of unsold jerseys that feature his current number. A source said one reason the price was so high for Cook to change his number was that league officials have expected “33 to be a top-selling jersey and therefore have already produced a lot of inventory.”

The new NFL rule, which passed Wednesday, allows for more players, including running backs, to wear single-digit numbers. Cook wore No. 4 at Miami Central High School and Florida State before taking No. 33 after being drafted by the Vikings in 2017.