Bristol City confirm Iriekpen trial
He had agreed terms with the Scottish Premier League team Hamilton Academicals, who were expecting to complete the deal on Friday.
Instead he was in Somerset looking to win a deal with the Robins, who are looking for cover for their first-choice defensive pairing of Louis Carey and Liam Fontaine. Jamie McCombe, the former Iron defender, is recovering from stomach surgery.
"We're looking at him for a few days, and we'll have to make a decision one way or the other," Johnson told City's official website.
"He's missed about a month's worth of football after turning down a contract at Scunthorpe."