The 46-year-old ex-England and Newcastle player, who left rehab in the United States earlier this year, was held after an incident in Hertfordshire.
A Hertfordshire Police spokeswoman said: “Police were called to a report of a man allegedly being drunk and disorderly at Stevenage railway station at 10.30pm on Thursday July 4.
“Officers attended the location and arrested a 46-year-old male on suspicion of common assault and being drunk and disorderly.”
He was taken into custody but was not charged, police added.
He told ITV1’s Daybreak in March: “‘I didn’t ask to be an alcoholic, but I must admit I worked on it. ‘I went to any lengths to get my drink, I’ll go even further to stay sober.”