Several Arsenal players featured for their national teams on Friday. While you may not care about how they performed - after all, Arsenal don't get extra points for things that happen in World Cup qualifiers - you probably care about the health of all the players involved. So I'll cover that in addition to the actual performances. Spoiler alert: pretty much everything is fine.
Jack Wilshere and Theo Walcott both started in a 4-0 win over Moldova. Reports were that Wilshere worked well with Steven Gerrard and Frank Lampard, but also took a little bit of a beating. Theo created a goal for Rickie Lambert by having a powerful shot saved. Other than that, not a lot to write home about. Wilshere was subbed off after 60 minutes. Neither was injured.
Aaron Ramsey played the full match and scored the only Welsh goal in a 2-1 loss, drawing a penalty and converting it himself. He was not injured.
Tomas Rosicky played the full match and scored the only Czech goal in a 2-1 loss to Macedonia, on a deflected long shot. He was not injured.
Possible free agent striker target Ciprian Marica scored and assisted in a 3-0 win over Hungary. He came off after 80 minutes. As far as I can tell, he was not injured.