By Nick Teale
Olympiacos defender Olof Mellberg has described Arsenal as one of the best attacking sides in Europe but has faith in his team's defensive ability to stop the Gunners.
Olympiacos come into the match having only conceded two goals in 10 games this season, but Mellberg knows Tuesday night's match will be a stern test.
"It will be a really tough match," said the 32-year-old. "We will need to be on top of our game all over the pitch.
"They're probably one of the best teams in Europe at playing quick football. We've defended well so far this season and we need to do that to stop Arsenal.
"Going forward they are one of the best sides, not only in England, but in Europe."
Mellberg scored the first competitive goal at Emirates Stadium when his former team Aston Villa earned a 1-1 draw on August 19, 2006, something he remembers fondly.
"We played in the first ever game here and I scored the first goal. We got a draw too so it was a good game and I have happy memories of it."Copyright 2015 The Arsenal Football Club plc. Permission to use quotations from this article is granted subject to appropriate credit being given to www.arsenal.com as the source