The agent of ex-Birmingham striker Nikola Zigic has told SPORT that Arsenal have expressed an interest in his client.
Birmingham manager Lee Clark is yet to decide whether he will be putting terms to trialist Matty Pattison.
Watford striker Chris Iwelumo has joined Oldham on loan until the end of the season.
The 34-year-old joined Watford in 2011 and scored five goals in 47 appearances before playing five times for Notts County on loan earlier on this campaign.
Iwelumo has four Scotland caps to his name and counts Stoke, Colchester, Charlton, Wolves and Burnley as former clubs.