A strong second-half performance earned Oldham a 34-20 win at Hunset to cement a second-place finish in Betfred League 1.
Roughyeds trailed 20-18 at half-time in this 20th and last game of the regular season, but they responded to some harsh words from coach Scott Naylor at the interval to score 16 unanswered points in the second half and record their ninth win in their last ten outings.
Danny Langtree scored a try hat-trick and other tries were scored by Danny Bridge and Paul Crook, who also landed seven goals from eight shots including three second-half penalties.
In the play-offs to find the club which will join league winners Whitehaven in the Betfred Championship next season, Roughyeds will have a blank weekend next before playing the winners of Newcastle v Doncaster on the weekend of September 21 and 22 at the Vestacare Stadium.
Match details will be announced on the club website, social media platforms and in the local press as soon as they are confirmed.