Leonid Slutsky has won just one of his five games in charge of Hull City
Doncaster Rovers inflicted a third straight defeat on a much-changed Hull City to knock them out of the EFL Cup.
Hull manager Leonid Slutsky made 11 changes to his side, handing six players their senior debuts against League One side Rovers.
The visitors held firm until half-time, but Alfie May opened the scoring with an accurate finish from 15 yards.
Tommy Rowe made it 2-0 soon after with a drilled shot, while Ben Whiteman and May also hit the woodwork for Rovers.
Hull's injury problems were a hindrance to Slutsky following Championship defeats by Wolves and Queens Park Rangers and his starting line-up had amassed just six starts for the club between them.
The young Tigers side fought well until May smashed in his fourth goal in as many games shortly after half-time and Rowe quickly produced a similarly accurate finish.
The League One side had much the better of the opportunities and could have won by a wider margin, with Hull mustering just a single attempt on target.
