Gary Lineker introduces highlights and analysis of Saturday's Premier League games, as Arsenal take on Sheffield United and Chelsea host Brentford in a west London derby.At the Emirates, Mikel Arteta's Arsenal are aiming to protect an unbeaten home record against Sheffield United that dates back to 1971. On their last trip to north London in September, to face the Gunners' rivals Tottenham, the Blades came close to pulling off a surprise win only to agonisingly concede twice in injury time.Across London, rivals Brentford travel the short distance to Chelsea, aiming to secure a hat trick of wins at Stamford Bridge, a ground they had previously only won once at in their history.Other matches include a crucial match towards the foot of the table as Bournemouth host Burnley, while Wolves welcome Newcastle to Molineux.