Arsenal are expected to sign Sol Campbell on a short-term deal after he featured for the reserves on Tuesday night.
The 35-year-old is currently without a club after leaving League Two side Notts County last year, having played just one game for the Magpies.
Campbell has been training with Arsenal since leaving County and he is believed to have impressed Gunners boss Arsene Wenger.
Wenger refused to rule out a move for Campbell last week after reports first emerged of a possible move back to Arsenal.
Campbell's likely return has moved a step closer after he played 45 minutes for Arsenal's second string in the 4-2 win against West Ham at Upton Park.
A short statement on the club's official website said: "Tonight's reserve team to face West Ham United at Upton Park features Sol Campbell, who plays on a Reserve League registration, with a view to a permanent move back to Arsenal Football Club."
Campbell, who had a five-year spell with the Gunners between 2001 and 2006, has been linked with a number of clubs since his acrimonious departure from Notts County, but it appears he is set to make a shock return to North London.