HARRY Redknapp is contemplating changing his defensive system again.

The QPR boss has seen his side lose both their away league games 4-0 this season – at Tottenham and Manchester United.

Tomorrow Rangers roll up at Saints, who have yet to concede a home goal and who hammered Newcastle 4-0 last time out at St Mary’s.

Ex-England star Rio Ferdinand has played every minute of QPR's five league games so far and is set to start at the heart of the defence tomorrow.

The veteran has predominantly been used in a central defensive trio this season and, while Redknapp reverted to a back four against Stoke last weekend, the QPR boss says 3-5-2 remains an option.

“I have thought about it this week, it's in my mind," Redknapp said ahead of his second return to St Mary’s since controversially quitting in 2005.

“I spoke to the coaches, we had a meeting and chatted about it - it's something that I wouldn't discard.

“I bought the little right back Mauricio Isla in to play right wing back from Juventus and Armand Traore is a left wing back really.

“I've also got five centre halves and I like all of them - to play three of them would suit us fine.”

Southampton have dispelled doubts surrounding their summer transfer policy by taking 10 points from their opening five games and beating Arsenal in the Capital One Cup on Tuesday.

Saints' excellent start under new boss Ronald Koeman sees them sitting second in the Barclays Premier League table, three points behind Chelsea.

“I've been very surprised at how well they've done, it's been amazing,” said Redknapp.

“They keep producing good players there, they've got this conveyor belt of kids coming through.

“They've bought well - Ronald Koeman has got a couple of good players from Holland that he knew and they're a powerful outfit again.”