The Blue Jays traded Jansen at the trade deadline this year to the Boston Red Sox as he was on an expiring contract and while Kirk did an incredible job in the second half of the season, brining Jansen back would be a solid move.
Even if the Blue Jays do not end up signing Jansen, they should most definitely look into signing another catcher even if he ends up in Triple-A because if injuries show up, they will be in serious trouble.