Chelsea boss Andre Villas-Boas to shake-up leaky defence after Arsenal shocker

Andre Villas-Boas is considering a defensive shake-up after watching his side concede five against Arsenal last Saturday. Chelsea travel to Blackburn after back-to-back Barclays Premier League defeats and the Portuguese is set to make changes to his back four at Ewood Park. Gunned down: Robin van Persie scored a hat-trick as Arsenal beat Chelsea 5-3 on Saturday Jose Bosingwa - who has been highly criticised in recent weeks - could be dropped in move that would see Branislav Ivanovic shifted out to right-back. John Terry will return to the heart of Blues defence after being rested for the midweek 1-1 draw in Genk and will be partnered by either David Luiz or Alex on Saturday. Chelsea have not kept a league clean-sheet since the opening day draw against Stoke, something that has not been lost on Villas-Boas. All change: Jose Bosingwa faces the axe after Arsenal defeat 'Defending is about collective organisation,' said Villas-Boas.  'If there are collective mistakes, we have addressed them. We went a step up in our organisation against Genk. We have to continue to transfer that into our games.'  Firing Line: Will Kean be feeling the Blues? Under pressure Rovers boss stays topTerry hit by racist hoax tape: Police probe doctored YouTube clip of Chelsea captain