After a difficult stint at RB Leipzig, Carvalho was recalled to Liverpool as soon as the January transfer window opened.
The Portuguese only clocked 360 minutes while on loan in Germany, which was far from the plan when a temporary exit was agreed for his second season on the books.
But there was no intention from the Reds to retain Carvalho for the second half of the season, with the club instead fielding a range of domestic loan offers.
Manager Liam Rosenior has demonstrated his willingness to trust young players during his time at Hull so far, not least with Morton commanding a key starting role in midfield.
The hope will be that Carvalho proves similarly important, as he bids to build up game time and impress in the second tier.
Delap had most recently been a regular on the right wing, which could offer Carvalho an immediate route into the starting lineup in Rosenior’s 4-2-3-1.
Carvalho will go straight into the squad for Friday’s clash with Norwich.
Good luck, Fabio!