Alan Irvine insisted he shared Albion fans’ frustration after they narrowly avoided Capital One Cup humiliation to the Football League’s bottom club.
But the Baggies boss admitted his side had been “careless and ragged” as they reached round three by the skin of their teeth with victory over Oxford on penalties.
Jason Davidson sealed a 7-6 penalty shoot-out win against Oxford United to spare the Baggies’ blushes after they had squandered a lead against the League Two outfit.
But they were still booed by home fans at full-time and after extra-time after a lacklustre display almost saw them dumped out of the competition in embarrassing fashion.
Irvine said: “No-one will have been more frustrated than me standing on the sidelines watching that.
“I am relieved that we got through the tie but I was very disappointed with lots of aspects of our performance and with lots of the decisions we made.”
The Baggies were booed off after 90 and 120 minutes after a dreadful second-half display gave Oxford the chance to knock them out on penalties.
But Australia international Davidson netted the winning spot-kick on his full debut after Boaz Myhill had saved the 17th penalty of an epic shoot-out from Jake Wright to give the home side the advantage. Earlier James Morrison and Brown Ideye had seen poor penalties saved by Max Crocombe in the Oxford goal while Myhill had kept out an effort from Michael Collins and Tom Newey had slotted wide for the Us.
Albion had dominated the first half and led through a bizarre 29th-minute own-goal from Jonny Mullins.
But they were awful after the interval and had survived several near misses before Danny Hylton struck.
Irvine said: “In the second half I felt we were comfortable but then we lost our shape and discipline and started making some really poor decisions and suddenly we turned what was looking like a comfortable game into one that was extremely uncomfortable.
“Oxford capitalised when we got careless and ragged.”