Erik ten Hag says Manchester United are not in a position to underestimate any opponent as his stumbling side look to keep their hopes of silverware alive in Sunday's FA Cup clash at Newport.This has been a challenging second season in the hotseat for the Dutchman, whose side languish eighth in the Premier League and were eliminated from European competition before Christmas.United’s Carabao Cup defence is also long since over, meaning the FA Cup takes on extra significance as their only potential route to a trophy in a disappointing campaign."It is the truth," Ten Hag said. "But it is true that the league, of course, (offers) qualification for the Champions League."But the FA Cup probably is, it’s fact, the last opportunity for a trophy, so we would go for it."FA Cup glory would be a welcome shot in the arm for a club that is preparing to go through a big transition under Ineos, who are set to take control of football operations next month.Incoming minority owner Jim Ratcliffe has a bloody-minded focus on improvements across the board and this competition could provide the platform for under-scrutiny Ten Hag to impress.United have a kind-looking fourth-round assignment at Newport, but there is no chance of complacency seeping in against the mid-table League Two outfit."Also in the Netherlands we have a cup and also we also play against lower-class teams," Ten Hag said of Sunday’s trip to South Wales."I know always when you go as a big club to a lower class team, how it will be and how you have to approach that."Definitely us, we are definitely not in a position to underestimate any opponent, so we will not do."By "lower class" Ten Hag seems to mean lower league, with Newport the lowest ranked side he has faced in any