By Scott Trotter Arsenal have provoked fear in some supporters with the absence of Bukayo Saka from the club’s latest release of training ground photographs. The England star was missing from Arsenal’s win over Luton Town after featuring for 78 minutes against Manchester City, where he limped off following an injury-hit international break. There was hope that Saka could return to face Brighton on Saturday evening but they may now have taken a hit. In his press conference ahead of making the trip to the Amex Stadium, Mikel Arteta noted that the Gunners would know whether the winger was fit in …