Injury scare for England ahead of SA Tour
Injury scare for England ahead of SA TourSHARE
Joseph was on crutches after suffering what appeared to be an issue with his left ankle having been caught awkwardly at a ruck shortly before the half-hour mark.
The outside centre, a fixture in the England team since 2015, was in obvious discomfort.
England coach Eddie Jones will await news on a setback that could prevent Joseph from adding to his 40 caps when the national team tour South Africa in June.
It was a worrying development for injury-hit Bath, whose season continued to deteriorate as they slumped to a fifth defeat in six Premiership matches.
Saracens had the bonus point in the bank in the 49th minute when Owen Farrell scored and they are now guaranteed a top-four finish.
Sam Simmonds bagged a hat-trick as Premiership leaders Exeter clinched a home semi-final with a 45-5 rout of London Irish.
Simmonds' heroics ensured Premiership champions Exeter booked themselves home advantage in the play-offs, with Ben Moon, Mitch Lees and Jack Yeandle also scoring tries.
Exeter took a step closer to topping the Premiership's regular-season table, maintaining their eight-point advantage over second-placed Saracens.
Irish's 17th defeat in 20 league matches leaves the bottom club staring down the barrel of a second Premiership relegation in three years.
New boss Declan Kidney surely cannot now save the Exiles, who trail Worcester by nine points with only a maximum 10 on offer in their final two matches.
Prolific England number eight Simmonds took his Premiership try tally to 12 for the season – just one behind the league's top scorer, Worcester's Josh Adams.
Flyhalf Gareth Steenson ended the day with a flawless 15-point return from the tee