Unai Emery explains decision to substitute Torreira for Ozil
According to Emery, the change was simply precautionary, after the Uruguayan international was involved in a nasty incident with Watford skipper Troy Deeney, who saw red after appearing to have intentionally elbowed Torreira.
Torreira, who until his substitution was having a good game, was taken off at halftime, with the Germany international taking his place but in a more advanced role up the pitch.
"First I decided to do the change of Lucas Torreira because after the red card, the atmosphere is against him and also the doctor said to me in the first half that he has a little pain for Thursday and I decided okay, it’s the moment [to take him off]," he told Arsenal’s website.
"At the end the, doctor said to me that they are okay. Only in the first half with his small injury, Lucas Torreira, but I think it’s small and he can be ready for Thursday physically. It was a very physical match today but I think we can respond well and above all the result gives us the opportunity to continue in our way, being consistent in the table," he added.
Arsenal was not at their best against Watford and struggled despite their opponents playing with 10 men for the better half of the match after Deeney's red.
They, however, held on for the important win, which saw them climb to fourth spot on the English Premier League standings.
The team will now head to Italy to face Napoli in the Europa League second leg tie on Thursday carrying a 2-0 advantage after the first leg at the Emirates.