Jansson’s Brentford side took on second-bottom Watford at Vicarage Road on Saturday and took a 15th-minute lead through Christian Norgaard.
Emmanuel Dennis drew Watford level ten minutes after the interval but Bees captain Jansson condemned the Hornets to a tenth home defeat in a row when heading home a 95th-minute winner.
Victory put Thomas Frank’s Bees on to 39 points and in 11th place in the Premier League table, 15 points clear of the drop zone and with five games left.
Roy Hodgson’s Hornets, though, remain six points behind fourth-bottom Everton and now having played two games more.
Watford are 11 points behind fifth-bottom Leeds, both sides now having six games left.
Taking to social media after his late winner, Jansson said: “Save them goals to the important moments I heard. No words can describe the love for this team, squad and club.”
Check out the latest Premier League transfer speculation below...
1. Spurs eye Eriksen
Tottenham are keeping tabs on Christian Eriksen as they plot a sensational reunion. Various Premier League clubs have been linked with Brentford ace. (Football Insider)
2. Wolves may have to sell Neves
Wolves may have to accept that they will have to cash in on midfielder Ruben Neves this summer. (Pete O’Rourke)
3. Henderson attracting attention
Bournemouth and Middlesbrough have joined the likes of Fulham, West Ham, and Newcastle United in the race to sign Manchester United’s Dean Henderson. (The Sun)
4. Liverpool keen on Ramsay
Liverpool are ‘chasing’ Aberdeen right-back Calvin Ramsay this summer. Leeds United have been linked in the past. (Various)
5. City close to Mahrez deal
Manchester City are ‘near’ to agreeing a new contract with Algerian attacker Riyad Mahrez. (TEAMtalk)
6. Battle on for Sunderland starlet
Everton and Newcastle are both trying to sign Sunderland wonderkid Chris Rigg. The 14-year-old is incredibly rated at £1 million, despite his age. (The Sun)