St Georges 2-0 win over Gymnasium on Wednesday night means that three points against Douglas High School Old Boys will secure the title.
Geordies led 1-0 at half-time with island international Jack McVey crossing for Alex Harrison to power home from close range.
Gymns started the second half well but when McVey converted a dubious penalty decision the points were tied up.
Geordies are now two points behind Peel with one match to play.
Meanwhile, St Mary's finished their campaign in fourth after a 1-0 victory over Michael United.
Steven Priestnal headed the deciding goal midway through the second half.
Results, 13 May
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Gymnasium 0-2 St Georges
St Mary's 1-0 Michael United
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