EDINBURGH try machine Tim Visser is wary of the attacking threat posed by the 'very dangerous' Newport Gwent Dragons in Friday's European Rugby Challenge Cup semi-final at Murrayfield.

The Scots, who convincingly won the Guinness Pro12 fixture 24-10 in October, will start the last-four encounter as slight favourites after edging out London Irish in the quarters.

However, the men from Rodney Parade head north on a four-game winning streak and Scotland wing Visser, the Celtic League's top try scorer in 2010, 2011, 2012 and 2013, says there is no chance of Edinburgh taking their visitors lightly.

"Dragons are a very physical team, very direct at the breakdown," Harlequins-bound Visser told the Scotsman.

"But if needed they can play wide, fancy rugby as well so they're a very dangerous team and we're not going to be underestimating them, even though we're at home."

Edinburgh head into Friday's game on the back of a 34-3 thrashing at the hands of Munster, a display that coach Alan Solomons acknowledged was nowhere near good enough.

"We know we have to lift our performance," said the South African. "For those on the field, we didn't do justice to ourselves."