He will return and be a sophomore next season.
At DI schools, the player will only have 3 years of eligibility (depending on their collegiate gpa, they may be granted a 4th year of eligibility if they maintain a 2.7 cumulative GPA or higher) - if they choose to play their 4 year of eligibility they will be playing as 5th year Seniors. At DII schools, the player will have 4 years of eligibility. In both situations, they will be eligible to play beginning with their sophomore year, assuming they have a cumulative GPA of 2.0 or higher after their freshman year.
https://www.whatifsports.com/hd/help/faq.aspx