The NFL announced Tuesday the Minnesota Vikings running back will be suspended without pay for the remainder of the 2014 season and cannot be considered for reinstatement before April 15, 2015.

Commissioner Roger Goodell expanded on his decision in the following letter to Peterson:

“The timing of your potential reinstatement will be based on the results of the counseling and treatment program set forth in this decision. Under this two-step approach, the precise length of the suspension will depend on your actions. We are prepared to put in place a program that can help you to succeed, but no program can succeed without your genuine and continuing engagement. You must commit yourself to your counseling and rehabilitative effort, properly care for your children, and have no further violations of law or league policy.”

The NFLPA filed a non-injury grievance last week on Peterson’s behalf. On Tuesday, arbitrator Shyam Das ruled in favor of the league, NFL Media’s Ian Rapoport and Albert Breer reported per league and union sources. This means Peterson remains on the Commissioner’s Exempt List while he awaits the result of a planned appeal. The running back will continue to be paid while he’s on the list.

Rapoport reported that the running back will officially file the aforementioned appeal Tuesday, according to a source close to the Vikings star. However, a league source tells Rapoport that it is unclear whether Goodell will hear it, as the union wants a neutral arbitrator.

Peterson was most recently coming off a Monday hearing on his status on the Exempt list, which opened the door for Tuesday’s decision by the NFL. Barring a successful appeal, they will not get that chance until training camp in 2015.

Peterson will lose $4.2 million during his suspension over the next six games and isn’t owed any more guaranteed money, Rapoport added.