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Ashley Williams believes Sunday's trip to Tottenham will be a major test of Swansea's improved away form.

It took Swansea until January 2 to pick up their first win on the road in the Barclays Premier League when they won 2-0 at Aston Villa.

But the Swans have won three of their last four league games away from the Liberty Stadium having collected victories at West Brom, Wigan and Fulham, with defeat to Stoke the only blip in that sequence.

But the trip to White Hart Lane to face a Spurs team targeting Champions League qualification for the second time in three seasons is likely to prove a bigger hurdle, something Wales international Williams is well aware of.

The 27-year-old defender said: "They are a very good team and one I enjoy watching, they play good attacking football and I'm sure Spurs fans have been having a good season watching their team.

"They've had a bit of an indifferent run but they have some quality players who can hurt you.

"People have seen our development away from home and how we have tried to manage those periods when teams come at us.

"We are working hard all the time to try and learn from the games we've played.

"We've got a good balance away from home but this is going to be a massive test for us.

"We've worked hard for our clean sheets and we'd love to get a few more before the end of the season."

Williams has been among a number of Swansea players to make a big impression in their first Premier League season, producing a number of authoritative displays alongside Steven Caulker in the centre of defence.

And Williams insists he is back to full fitness for the trip to face Tottenham, who have been linked with Swans manager Brendan Rodgers should Harry Redknapp land the England job, after being laid low by a virus in recent weeks.

The illness forced Williams to miss the win at Fulham, ending a run of 169 consecutive appearances, and he admitted he felt below his best in last weekend's defeat to Everton having sat out training during the week.

And the former Stockport defender admits he has no idea how Tottenham's Ledley King, who has been bedevilled by knee problems and may miss Sunday's game having featured against Bolton in midweek, manages to cope with the rigours of the Premier League given his limited involvement in first-team training.

"I'm feeling a lot better, I've had a full week's training," he said. "I've been really lucky with illness and injury, I'd forgotten what it was like to be ill and I don't want it again any time soon.

"I watched the Fulham game on the internet and it was weird because I was so nervous.

"It was strange watching the team, it was just very frustrating.

"I didn't train at all last week, came back into the game and struggled big time.

"I couldn't do it so for Ledley to do it all the time shows just how good a player and professional he is.

"He must look after himself very well.

"Your touch, co-ordination, all the things you take for granted can be affected and you can lose it pretty quickly.

"I've watched him for years and he is an unbelievable player."