Having represented England at Under-21 level, the Irish-qualified hooker was selected to play for Ireland 'A' against Tonga in November 2009.
He previously played for Sale and Leeds and enjoyed a successful loan spell with Munster during his five-year stint with Saracens.
Neil McComb signed his first professional deal at the start of the current season, having previously been on a development contract with Ulster.
The 27-year-old lock has played eigh times for the province at senior level and has been rewarded for his hard work with a contract extension.
He captained Campbell College to Ulster Schools Senior Cup glory in 2002 and has been an integral member of the Belfast Harlequins first team in recent years.