Robert Green believes England will have to do their homework to ensure they are prepared for 2010 FIFA World Cup opponents Algeria on Friday.
The north Africans have undoubted quality after defeating Africa Cup of Nations winners Egypt in a play-off, but the West Ham United goalkeeper - who has been training hard this week after an eventful 90 minutes in the 1-1 draw against the United States last Saturday - admitted many of their players are not known to Fabio Capello's squad.
While Portsmouth midfielder Nadir Belhadj, Rangers defender Majid Bougherra and Wolverhampton Wanderers midfielder Adlene Guedioura are familiar to England, many of their international team-mates ply their trade in either France, Germany or their home nation.
"They are obviously a very good team, having come though the African qualifiers and beaten Egypt," he told whufc.com. "They have got some players who play in the Premier League who we know and players who don't that we need to find out a lot more about. In that respect, we'll have to sit down and read and watch a lot more about them.
"To have qualified for the World Cup out of the African qualifying stages is no mean feat and is something that is really quite impressive and not to be taken lightly in any sense.
"I know Belhadj from Portsmouth and Bougherra from Rangers and I'm sure, by the time we play them, we'll be well-versed in every player and every detail about their game.
"It will be similar to when we played Mexico in that we didn't know everything about every player, but by the time we started the game we knew pretty much everything about everybody - that's the sort of detail you go into."
