Trimble was part of the Ulster team that beat the Scarlets on Friday evening and is joined in the Ireland camp by Gavin Duffy, Denis Hurley, Rhys Ruddock, Tony Buckley, Donnacha Ryan and Mick O'Driscoll.
British & Irish Lion Stephen Ferris has been ruled out of the game with a knee injury and is set to see a specialist later this week.
Ireland face Scotland this weekend and care currently fourth in the table after victory over Italy on the opening weekend followed by defeat to France at the Aviva Stadium in the last round of action.
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