Bristol's Noah Heward is being seen to for a knock to the head but the game continues.

The Bulls flay half is near halfway but it's straight onto the posts and he has no problems to see the South Africans take the lead.

Bristol waste a line-out on the Bulls 22, then the visitors race out of defence with Sergeal Petersen chipping it down the left touchline into the opposition half.

Petersen then forays into midfield before Bristol concede a penalty.

Ooooof! The Bulls put in a mighty shove to force Bears into a penalty, which gives the Bulls the chance to kick over halfway.

And we're off! There's a knock-on in the opening 20 seconds and Bristol get a scrum just inside the Bulls half.

BBC Radio 5 Sports Extra

There's live radio coverage of the action from Ashton Gate on Radio 5 Sports Extra with punditry from ex-England prop Gareth Chilcott, you can find the link at the top of this page or go to BBC Sounds.

There's some class in charge of both sides today as well, with Pat Lam coaching the hosts and Jake White, who masterminded South Africa's 2007 World Cup triumph, for the Bulls.

Bristol have a win and a loss from their first two Champions Cup games, edging out Lyon 36-34 before losing 36-17 at Bordeaux-Begles.

Bulls began their campaign with a 27-16 win over Saracens but then followed that with a narrow 29-28 defeat at Lyon.

So a win today for either side will put them in a great place for a top four finish with only one game to go.

Scrum-half Kieran Marmion makes his first start in the competition for the Bears after joining in the summer from Irish side Connacht.

Props Sam Grahamslaw and George Kloska replace Jake Woolmore and the injured Kyle Sinckler.

Centre Virimi Vakatawa is on the bench after missing last week's win at Sale.

Bulls coach Jake White has opted against travelling with some of his Springbok internationals, with Willie le Roux, Kurt-Lee Arendse and Canan Moodie all remaining back in South Africa for their final pool game against Bordeaux Begles on 20 January.

Bristol: Malins; Heward, Janse van Rensburg, Williams, Ibitoye; MacGinty, Marmion; Grahamslaw, Oghre, Kloska, Caulfield, Batley, Luatua (capt), Thomas, Bradbury.

Replacements: Capon, Woolmore, Lahiff, Owen, Heenan, Randall, Vakatawa, Lane.

Bulls: Williams; De Klerk, Kriel, Vorster, Petersen; Goosen, Papier; Steenekamp, Wessels, Louw, Vermaak, Ludwig, Coetzee (capt), Louw, Gumede.

Replacements: Lange, Matanzima, Mchunu, Nortje, Slabbert, Johannes, Smith, Immelman.

This packed weekend of European rugby rolls on with the Bulls pitching up at Bristol for what could be a really tasty Champions Cup encounter. Let's take a look at the teams.