Lucas Torreira requested to come off just before half-time against Costa Rica on Saturday morning, after picking up a knock.

HOUSTON, TX - SEPTEMBER 07: Martin Caceres #22 of Uruguay argues with referee Ismael Elfath after a penaltyb kick was given to Mexico in the first half during the International Friendly match between Mexico and Uruguay at NRG Stadium on September 7, 2018 in Houston, United States. (Photo by Bob Levey/Getty Images)
HOUSTON, TX – SEPTEMBER 07: Martin Caceres #22 of Uruguay argues with referee Ismael Elfath after a penalty kick was given to Mexico in the first half during the International Friendly match between Mexico and Uruguay at NRG Stadium on September 7, 2018, in Houston, United States. (Photo by Bob Levey/Getty Images)

Torreira made the starting lineup for Uruguay’s match against Costa Rica on Saturday morning, or Friday night in their timezone. The Arsenal midfielder played well in the first half, but he was forced to come off early after picking up a minor injury.

Torreira was substituted for Nahitan Nandez just before half time, and Uruguayan outlet LaRed21 report that Torreira “asked for the change because of a knock”.

The problem doesn’t seem to be anything serious, though it is a little worrying that the 23-year-old didn’t think he could last a couple more minutes to the half-time whistle. We’ll have to wait for further updates from Uruguay boss Oscar Tabarez.

Torreira only made his first start of the season on Sunday, playing just over an hour against Tottenham Hotspur. After being away on international duty with Uruguay over the summer, the midfielder missed most of pre-season, so he’s been slowly building his fitness.

It’s possible Arsenal push for Torreira to return now, after they withdrew Nicolas Pepe from his Ivory Coast duties for further fitness focus. Like Torreira, Pepe missed pre-season with the Gunners.