Northern Ireland registered an historic 2-0 victory over Ukraine in their second Group C game at the Euro 2016 finals in France.
West Bromwich Albion defender Gareth McAuley headed in Oliver Norwood's perfectly delivered free kick just four minutes into the second half.
Niall McGinn finished a rebound in stoppage time to give Northern Ireland their first victory at a major tournament finals in 34 years.
Lafferty was an unused substitute against Ukraine, but he was still pleased to see his teammates get the job done.
The former Burnley forward has also praised Leeds United winger Stuart Dallas, Queens Park Rangers forward Conor Washington and Nottingham Forest midfielder Jamie Ward for their performances on Thursday.
Disappointed I didn't feature but as a n.ireland fan I am absolutely buzzing and couldn't be happier for the whole team.— (@LaffK) June 16, 2016
Northern Ireland will take on Germany in their final Group C game next Tuesday.