Pressure is mounting on coach Claudio Ranieri [ Images ] as his stumbling Juventus [ Images ] side host nine-times European champions Real Madrid [ Images ] in Turin in the standout clash of Tuesday's Champions League [ Images ] ties.

Real are top of Group H with maximum points and Juve are also well-placed with four points from two matches although defeat would leave them vulnerable.

Two consecutive Serie A defeats have left Juventus stuck in mid-table and they are not helped by the absence of striker David Trezeguet and keeper Gianluigi Buffon with injuries.

Elsewhere on Tuesday, defending champions Manchester United [ Images ] and Celtic meet at Old Trafford in Group E with the Scottish side looking to end a demoralising away run in the Champions League that reads 17 defeats and one draw in 18 trips.

The top two meet in Group F when Bayern Munich [ Images ] host Fiorentina. Bayern hope to have Italian striker Luca Toni fit after suffering a rib injury.

In Group G, leaders Arsenal [ Images ] travel to Istanbul to play Fenerbahce, their first meeting with Turkish opposition since 2000 when they were beaten by Galatasaray in the UEFA [ Images ] Cup final in Copenhagen.