Jansson joined Brentford from Championship rivals Leeds in the summer of 2019.
The Sweden international central defender came close to clinching promotion from the Championship with the Whites last season.
Both Leeds and Brentford are in the running for automatic promotion to the Premier League.
Jansson has said that he hopes that both the Whites and the Bees go up, and the 29-year-old has also raved about Leeds head coach Marcelo Bielsa.
Jansson told Football.London: “When I came here I said to the fans that I hope both can go up.
“It is possible but the dream would be that both we and Leeds go up. I’ve left Leeds but they are still part of my football life.
“I follow them and have friends among the coaches and players. Of course I want success for them, just not on our behalf. If they go up with us that would be nice.”
The Swede added: “Marcelo forced me to be a better person both on and off the pitch.
“It felt like my first two seasons I was trying to get booked every game, looking to have a fight with a player and dialogue with the referee.
“Silly, stupid things. But I’ve learnt a lot. It comes with experience, this is a better version of Pontus.”
Leeds are at the top of the Championship table at the moment with 74 points from 39 matches, three points clear of second-placed West Bromwich Albion.
Brentford are currently third in the standings with 66 points from 39 games.
While the Whites are favourites to clinch automatic promotion to the Premier League, the Bees are doing well at the moment and could dislodge the Baggies from the second spot in the standings.