Sometimes, a player can be made to look worse when he's off the field. That was the case here for West Ham United's Valencia, as substitute Diafra Sakho showed the Hammers exactly what they were missing when he replaced the forward.
Valencia produced a disappointing display at Bristol City, with Sakho - who was short of fitness and so didn't start - threatening and finding the space to score with relatively little effort after coming on for the Ecuadorian.
Another West Ham star to disappoint against the League One side was Song in an uncharacteristic display from the 27-year-old. The midfielder didn't look at all convincing with his tackles and gave the ball away with unusual frequency.
This was perhaps a case of a player used to turning out in Premier League and Champions League matches who wasn't quite motivated at the prospect of a trip to Bristol. But Sam Allardyce would have been taking note if that was the case. No West Ham player is guaranteed a starting spot considering their strength in depth. Song's superb season so far, however, gives him plenty of leeway.
Yet again, West Ham fans have expressed their frustration with Nolan's performance after the Bristol City win.
It seems the Hammers faithful have grown more and more disappointed with the veteran week by week this term and, if Nolan struggles against League One midfielders, how does he expect to keep up in the Premier League?
Allardyce's faith in Nolan is understandable considering his experience and past exploits but his dip in form this season has tested supporters' patience.