Speaking after the game, Long admitted that he had no idea that he broke the record for fastest goal when he had scored it. Long told Sky Sports News with a grin after the game.
"It's nice. I didn't find out until after the game and I didn't know what the record was before", the Irish global told the Southampton club website.
Watford take kick-off, the ball goes back to Craig Cathcart at centre-back.
Scoring seven seconds into a soccer game is impressive enough, but that he managed to do it off of Watford's kickoff required the ideal blend of luck and talent.
Before many spectators even had a chance to get settled into their seats, Irish worldwide Long had charged down Craig Cathcart's clearance and chipped the ball over Ben Foster to open struggling Southampton's account.
"Mainly it's just to force that long ball so they're not quite set. Thankfully it came off", he said.
That is the only chance to beat this record because much faster is not possible I think.
"Everybody put in such a shift all over the park".
Watch the goal in the video player above.