Green-Beckham subsequently transferred to Oklahoma and the Sooners were denied a waiver by the NCAA that would have made the wide-receiver immediately eligible.
On Monday, Pinkel told the St. Louis Post Dispatch that he’s rooting for his former player.
“I want him to use this year to really help himself so he can come back and have a great year after that,” Pinkel said.
Green-Beckham was the most highly touted player ever to come to Missouri, ranked as the No. 1 recruit in the country by Rivals.com in 2012.
But he was suspended twice and was arrested twice on marijuana-related charges—one a felony—after arriving in Columbia and he was the subject of an investigation in connection with an alleged robbery in April.
The incident report from the Columbia Police Department claims Green-Beckham pushed a woman down several steps as well as injuring his girlfriend.
The victims, one who told the police in the incident report she feared the media attention and community backlash, did not press charges and the police dropped the case, but Missouri decided enough was enough and kicked Green-Beckham out of the program.
Green-Beckham had 59 catches for 883 yards and shared the SEC lead with 12 touchdown receptions last season for the Tigers.
He will have two years of eligibility remaining at Oklahoma, beginning in 2015.