Damien Gavin's side won the Andrew Cordon Cup with a one point win over Longford.
Westmeath's under 20 footballers are playing for an All Ireland final this weekend.
The Lake County won the tier two Leinster championship last time out, and will now take on Limerick in the All Ireland B Championship semi-final tomorrow afternoon in Thurles.
If Damien Gavin's side make it past the Treaty County they'll face one of Mayo or Down who play in the other semi-final on Sunday.
Throw in at Semple Stadium tomorrow is set for 1pm.
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