Welshman Thomas has been named in Sky’s line-up for the seven-day, WorldTour race alongside fellow Giro d’Italia co-leader Mikel Landa of Spain.
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The two riders spearhead a strong team for the British squad that also includes on-form Strade Bianche winner Michal Kwiatkowski of Poland, new recruit Diego Rosa and sprinter Elia Viviani.
The eight-man team is completed with Vasil Kiryienka, Gianni Moscon and Salvatore Puccio.
Thomas missed out on defending his 2016 victory in the concurrently running Paris-Nice in France to focus on his preparation for the Giro in May.
Thomas has ridden in six of the past seven editions of Paris-Nice. A change of early-season schedule to ride Tirreno will give him a chance to familiarise himself with the Italian terrain before May.
Thomas and Landa will face Grand Tour rivals Nairo Quintana (Movistar), Vincenzo Nibali (Bahrain-Merida), Fabio Aru (Astana), Thibaut Pinot (FDJ), Tom Dumoulin (Team Sunweb) and Adam Yates (Orica-Scott).
Watch: Geraint Thomas’s greatest win, in his own words
The 2017 Tirreno-Adriatico commences with a 22.7-kilometre team time trial in Lido di Camaiore and concludes on Tuesday, March 14 with a decisive 10.1km individual test against the clock.
Saturday’s stage four will be the key climbing test for those with aspirations of a high overall placing, with a ascent to the line on Terminillo.