By Sean Walsh Manchester United manager Erik ten Hag revealed he is not concerned by his side’s defensive solidity after conceding 31 shots to Brentford in a 1-1 draw on Saturday night. The Red Devils spent much of the game at the Gtech Community Stadium penned in and clung on for the majority of the evening, with the Bees rattling the woodwork at least three times and bringing several fine saves out of goalkeeper Andre Onana. Mason Mount gave United the lead against the run of play deep into second-half stoppage time, only for the visitors to switch off and concede almost immediately to Krist…