Watford head coach Beppe Sannino had no complaints at the outcome after his side slipped out of the Capital Cup.
Having seen League One Doncaster Rovers rip up the form book, he said: ““I am disappointed. Doncaster played better than us and they deserved it.”
Sannino made a host of changes following Saturday’s 4-1 win over Leeds and he said: “I give a chance to everybody and I stay always watching the pitch when these players are playing.
“Before the match I spoke with them and said you have to put me in difficulty to pick the next starting XI.
“For me tonight, this was a night I was disappointed for a lot of people, the fans here at Vicarage Road and they deserve another show.”
Meanwhile, West Ham fans taunted their Sheffield United counterparts with chants about Carlos Tevez - only to see their latest big-money signing miss the decisive penalty after an even Capital One Cup tie at Upton Park.
It was the first meeting of the two sides since the Blades were relegated, largely thanks to Tevez’s goals at West Ham - only for a legal wrangle over the Argentina international’s ownership leading to the Hammers paying out almost £30million in compensation.
There are now two divisions separating the clubs but it is Sheffield United who progressed into the third round after Enner Valencia, a £14million signing from Pachuca, was the only player to miss his spot-kick as tie could not be decided in normal time.
An Atdhe Nuhiu penalty gave Sheffield Wednesday a 1-0 victory at Premier League Burnley.