The 20-year-old was registered just in time to take part in this afternoon's League Two opener at Bristol City.
However, he has had to settle for a place on the bench, as Jon McLaughlin starts between the sticks for the Bantams.
Ripley, who has made three first-team appearances for Boro, was part of the England squad that competed in the Under-20 World Cup earlier this summer.
Bristol City: Fielding, Moloney, Flint, Fontaine, Cunningham, Wagstaff, Kilkenny, Wynter, Bryan, Emmanuel-Thomas, Baldock
Subs: Parish, Williams, Pack, Reid, Elliott, Taylor, Harewood
Bradford City: McLaughlin, Darby, Davies, McArdle, Meredith, Thompson, Jones, Doyle, Yeates, Hanson, Wells
Subs: Ripley, Reid, Kennedy, Taylor, McHugh, De Vita, Connell