Can scored a majestic overhead kick to settle matters and ensure third-placed Liverpool took full advantage of rivals Manchester City, Manchester United and Arsenal all dropping points over the weekend.
"Of course, we knew before the game what happened [on Sunday], with the other results, and it was a big, big step for us".
A lacklustre first half at Vicarage Road was drawing to a close when the German midfielder swivelled to connect with a Lucas Leiva chip towards the box and saw the ball curl into the top-left corner.
"I would like to say I'm used to it, but it's not the truth, especially not from Emre", Klopp told Sky Sports when asked about Can's goal. "He is a physical, strong boy and important for us".More news: Facing deadline, most Wisconsin dairy farms find new buyer
Third-place Liverpool were seeking to give themselves a three-point cushion over Manchester City, although they will have played a game more than Pep Guardiola's side. We rode our luck a few times last night against Watford, and once again provided a nervy finish as seems to be becoming the standard.
"It was a hard game as everybody saw". That means pressure. Pressure like they felt heading into Monday's game.
He said: "I have had some bad injuries but now I am fit and I want to look forward".More news: Young cancer survivor gets his wish at NFL draft
Philippe Coutinho was brought to tears in November after injuring his ankle against Sunderland which many thought would end his season, only for him to return in January.
Watford, on 40 points and all but safe from the drop, were not at the races as they failed to react to captain Troy Deeney's criticism following the recent defeat at Hull. I didn't think too much, didn't score too many like that.
As Watford threw the kitchen sink at Liverpool, desperate to secure a point from the Premier League clash, Sebastian Prodl smashed an effort that rebounded off the crossbar.
Liverpool and Manchester United fans continued their ongoing social media discussion over who is the better midfielder Paul Pogba or Emre Can following the goal.More news: Mark Selby and John Higgins progress at the Crucible
Walter Mazzarri's men sat back and frustrated their visitors, comfortably keeping them at arm's length for nearly the entirety of the first-half only to let their concentration slip towards the very end.