
The 26-year-old will play his first match since tearing his ACL in the first Test against South Africa last July.
Meanwhile, left wing James Lowe, who suffered a leg injury when playing for Ireland against Australia in the Autumn Nations series, will wear the Leinster shirt for the first time since October.
Second rower RG Snyman will confront some familiar faces, with the Stormers featuring many of his Springbok teammates, while Jordie Barrett adds quality and experience to a backline that features two young tyros in fullback Henry McErlean and Andrew Osborne.
Jack Boyle was furloughed from Ireland camp to get some game time and will join Sheehan and Lowe on a flight to Portugal to link up with Simon Easterby’s squad on Sunday morning. Rabah Slimani has been released from the French camp to play the game.
Leinster supporters will be interested to see how the younger generation, Brian Deeny and Alex Soroka in the run-on team and Paddy McCarthy, Rory McGuire, Diarmuid Mangan, James Culhane and Charlie Tector on the bench fare against a physically strong Stormers side liberally sprinkled with Springboks.
Warrick Gelant, Manie Libbok, Ben-Jason Dixon and Deon Fourie all come into the visitor’s starting line-up, where Evan Roos is a standout talent, while Frans Malherbe, Salmaan Moerat and Herschel Jantjies are named among the replacements.

LEINSTER: H McErlean; A Osborne, L Turner, J Barrett, J Lowe; R Byrne, L McGrath; J Boyle, D Sheehan (capt), R Slimani; RG Snyman, B Deeny; A Soroka, S Penny, M Deegan. Replacements: J McKee, P McCarthy, R McGuire, D Mangan, J Culhane, W Connors, C Foley, C Tector.
STORMERS: W Gelant; B Loader, R Nel, J Roche, L Zas; M Libbok, P de Wet; A Vermaak, J Dweba, N Fouche; JD Schickerling, R van Heerden; D Fourie, B-J Dixon, E Roos. Replacements: A-H Venter, B Harris, F Malherbe, S Moerat, M Theunissen, P de Villiers, H Jantjies, W Simelane.