Arsenal’s injury concerns are starting to pile up once again, with Mikel Arteta facing some bold decisions over the next week.Key stars such as Martin Odegaard, Noni Madueke, Kai Havertz, and Gabriel Jesus have been missing lately, but the Gunners have managed to get through with some fine form.Despite Arsenal’s latest win over Burnley, there were further concerns as an injury to Viktor Gyokeres leaves the side facing a spell without a striker if it’s a serious absence. Click to subscribe to the podcast There was one other injury for Arsenal that should worry Mikel Arteta just as much.Photo by Alex Pantling/Getty ImagesArsenal face fresh Martin Zubimendi injury concernArsenal’s injury concerns have been the main issue facing the team in the opening months of the season so far.The summer transfer business has helped cover many of those problems, but there could be further worries before the international break.The injury to Viktor Gyokeres is a big worry, after an impressive display against Burnley, but that is only furthered by an injury to Martin Zubimendi.With just over ten minutes remaining, the midfielder had to be withdrawn through a muscular problem, as revealed by Arteta after the game.He told the press: “Zubi [Zubimendi] as well, he asked to be subbed, so we’ll have to wait and see [on his injury].”It will be a huge concern for Arteta, given how much of Arsenal’s play has been conducted through the quality of Zubimendi in midfield.The 26-year-old took 81 touches in the match against Burnley, with an 83% pass success rate, as the game ran through him.Without him, there could be further concerns about how competitive the team could be when trying to play through the midfield.There are a few options to replace Zubimendi, but the most immediate choices are complicated after other injuries.Photo by David Price/Arsenal FC via Getty ImagesWho could replace Martin Zubimendi after injuryIf Martin Zubimendi is facing a spell on the sidelines, then Mikel Arteta will need to make some big decisions over his team.Mikel Merino is one option; however, that may be restricted by the lack of strikers, with the Spaniard seen as the next natural pick there.If he is chosen to play up front for Arsenal, then the next best pick will be Christian Norgaard, who came on in the final few moments.Beyond that, there is a lack of options, with two big games coming up before the international break is in full swing.