Shortly after Unai Emery had made his first substitution in Monday night's game, with Arsenal trailing Manchester United by a goal to nil, a table of statistics popped up on the Sky Sports screen.

Viewers were informed that Arsenal's substitutes had provided more Premier League goals than any other team since the start of last season. Fair enough. It got us wondering whether this latest change - the creative Dani Ceballos replacing the more defensive-minded Lucas Torreira - would get Arsenal back into the game.

So it turned out, just three minutes after the substitution, Arsenal were level. Ceballos, however, played no part. He was nowhere near play and wasn't even one of the four most advanced Arsenal players when Bukayo Saka intercepted Axel Tuanzebe's and slipped Pierre-Emerick Aubameyang in on goal to finish. The goal came from a defensive error and the change had made no direct difference.

It also turns out, on further inspection, there is more to the numbers presented by Sky than the initial inspection suggested.