Jacques Kallis has promised a different South Africa side will turn out on Tuesday after a rare one-day loss to England.

Graeme Smith's men were defeated for the first time in 10 limited-overs internationals at Headingley last Friday.

The Proteas came into the five-match campaign, which continues with a Trent Bridge day-nighter on Sunday, needing to secure a 4-1 victory to return to the top of the one-day rankings.

But their chances of leapfrogging world champions Australia were undermined by what Kallis termed their poorest performance in recent memory.

"From a team point of view it was the worst display we have had for probably two years," all-rounder Kallis said.

"We have had some time to sit down and reflect, and get into the nets to practice, but it is more of a mental change than a skills type of thing.

"The guys will come out and you will see a different side tomorrow.

"We arrived at the game and played it without really thinking about it - you can't do that at this level.

"Certainly not to the standard we have played over the last two years.

"You can't perform against top sides in the world at 65-70%.

"You have to be close to 100% if you want to beat those sides, especially the way England played such a good game all-round."

South Africa have struggled since the focus of their tour went from Test series victory to one-day mode earlier this month.

A combination of a first campaign win here since the 1960s and persistent rain wrecking meaningful practice has combined to knock them out of their groove.

But the South Africans have pride in their status as a limited-overs team and will be striving on a collective level as hard as Kallis will on a personal one.

Kallis struck 52 in Leeds to offer a reminder of the form which deserted him during the 2-1 Test triumph.

The 32-year-old, scorer of 30 Test centuries, managed only 104 runs in the series, just eight more than tail-ender Paul Harris.

"It has been nice that I have contributed with the ball," said Kallis, taking solace in his 10 wickets.

"I didn't think I would make such a contribution with the ball, I thought it would be with the bat.

"Hopefully I can turn things around in the one-day series and get some big runs.

"The whole tour I have never felt badly out of form, I have got a few good nuts along the way and a couple of balls I didn't see, which is an interesting combination.

"I am not out of nick, so there is no reason I can't get some big runs again."

South Africa will need their big-name players to come good given that they have acknowledged England gaining momentum under new captain Kevin Pietersen.

"We feel that for sure," said Kallis.

"But we have to come out and not worry about the opposition but our game.

"That has been our strength over the last two years, and if we play the kind of cricket we know we can there is no reason we can't turn it around."

But brothers Morne Morkel (side strain) and Albie Morkel (shoulder) are unlikely to boost the tourists' party by declaring themselves fit.

However, fast bowler Andre Nel is available after gashing his left leg in a challenge by Kallis during a soccer warm-up at Monday's practice session.