The former Beatle will appear on the track I Will Be There as Angelo Mysterioso, a pseudonym Harrison used throughout his solo career.
George first used the moniker when co-writing the song Badge for the 1969 Cream album Goodbye, according to Billboard.com.
The new Clapton album has another link to the Beatles - the cover art was created by Sir Peter Blake, who contributed to the Fab Four's Sgt. Pepper's Lonely Hearts Club Band album sleeve.
Despite the fact Clapton romanced Harrison's wife Patti Boyd and later married her, the two rockers remained friends and often collaborated. They appeared on each other's live albums in the late 1980s and early 1990s.
I Still Do is Clapton's first album of new material since 2013's Old Sock.
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