He played for Shamrock Rovers, Bohemians, VfB Lübeck, Dundalk, St Patrick's Athletic and Kilkenny City during his career.
He left Bohs in 1980 and had a short spell at VfB Lübeck in Germany before returning to Ireland the following year where he joined Dundalk.
Eamonn moved to St. Pats during the 1983/84 and stayed there until 1989, apart from a short spell on loan at Shamrock Rovers in 1987/88.
This was noted by the hierarchy at Bohs and in May 1990, he was offered the managers job at Dalymount and he duly accepted.
Gregg's next port of call was Shelbourne in January 1994 but his time at the club was a failure and he was sacked in November 1994.