By Sean Walsh Arsenal captain Martin Odegaard could be sidelined for a number of weeks after sustaining a nasty-looking ankle injury on international duty. The 25-year-old was hauled off in the second half of Norway’s 2-1 win at home to Austria in the Nations League on Monday night, having twisted his ankle at an alarming angle when competing with Christoph Baumgartner for a loose ball. Odegaard was substituted after receiving treatment for several minutes, and Norway manager Stale Solbakken admitted the injury didn’t look good after the game: “It looked bad in the dressing room as well. “I sa…