David Moyes-Ryan Giggs
Manchester United's manager David Moyes walks past Ryan Giggs during a training session.Reuters

Manchester United manager David Moyes has said there is still a lot of work to be done at Old Trafford after his side registered a 3-0 win over Olympiakos.

The Premier League winners had suffered a 2-0 defeat in the first leg of the Champions League tie against the Greek champions. United were successful in overcoming the deficit as they managed a 3-2 aggregate victory to progress to the last eight of the European competition.

United's display against Olympiakos was one of the few brilliant performances of the season. Robin van Persie's hat-trick helped the Red Devils seal a much needed win in the Champions League.

Despite their latest victory on Wednesday, Moyes is hopeful the result would help his side turn things around in the remaining fixtures left in all competitions in this season.

"That question [win as a turning point for United's season] has been asked of me every time we have a good victory and we've never backed it up. I'd love to say 'yes' and that's the answer, but I think we know we've got a lot of work to do here," Moyes told Sky Sports

"We've had a great result tonight and we're going to try and keep going in the competition. We know it is going to be a struggle. We're looking forward to whoever we get in the draw."

Moyes handed 40-year-old veteran Ryan Giggs a place in the starting lineup against Olympiakos. The Welshman was instrumental throughout the game as his two passes were crucial in the build-up for the first two goals scored at Old Trafford.

The Scot hailed Giggs' impressive performance saying: "I thought Giggsy was fantastic. The passes he made for the two goals, his general play - more importantly his general fitness."

"Sometimes you think he'll need to come off after 60 minutes but he's a freak. He's something different. It was a big night, we needed it. It was off the back of a bad result and I thought we needed his experience and he showed it."

United face West Ham United in the next league fixture on Saturday, before taking on their derby rivals Manchester City at Old Trafford on Tuesday.