Darnell Furlong had been flying high for West Brom but his display against Leicester shows he has a lot of work to do to reach Premier League standard.
The right-back has started each of our last nine games and helped Albion concede just eight goals over that period.
Against Chelsea and Southampton Furlong showed ambition in attack too, supplying Callum Robinson with a brilliant cross to score at Stamford Bridge.
He was making great strides and beginning to show he can compete at this level, having got off to a dreadful start to the season.
However, he threw his good form out of the window on Thursday, and with it his goodwill from Albion fans.
We cannot accept the standards Furlong showed – he barely completed a pass all game and was shocking in defence too.
Per SofaScore, the 25-year-old was successful with just nine passes out of 25, equating to an abysmal 36% pass accuracy.
That is unacceptable at any level, even non-league, and it is little surprise Leicester were relentless with their pressure – Furlong handed them possession 25 times.
He offered us nothing on the ball, failing in his two dribble attempts and in his two crosses, so he was a complete waste of space.
Jamie Vardy ran him ragged and he could not deal with the Foxes’ pace and movement.
His failure to make a single interception shows how he failed to cope, and Furlong was not much use in our box with zero blocks and just two clearances.
We hope this is just a blip from the full-back and not a sign he is returning to his early-season form.
Sam Allardyce has got the best out of him at times so he could be useful next season as we will likely be aiming for promotion.
That will be a good test for Furlong, as he has a lot to do to prove he has the quality to succeed in the Premier League.