Odell Beckham Jr. is suing Nike ... the NFL superstar claims the Swoosh swindled him out of millions of dollars by suppressing sales of sneakers that would've triggered a contract extension.
In a lawsuit obtained by TMZ Sports, 30-year-old Beckham Jr. -- currently a free agent -- filed the lawsuit in Oregon Tuesday afternoon.
Odell claims once his original Nike deal expired in 2017, he considered jumping ship to Adidas ... who offered him a huge contract. Not wanting to lose a marquee talent, Odell says Nike exercised their right to match the Adidas deal.