Rovers boss Big Sam Allardyce has explained why he took off David Dunn on Sunday and replaced him with Brett Emerton.

Some fans were left puzzled as to Why Dunn was being taken off against Chelsea, even though he had hardly put a foot wrong.

But Big Sam had noticed that the player was starting to struggle and made the switch as a precautionary measure, especially with such a big game coming up this weekend.

Allardyce told the club’s official site: 'I wasn't liking Dunny stretching his calves and things like that.

'It was telling me that if he carried on he might tweak a muscle again, so we took him off and put Morten in there and then of course we felt Niko had battled a lonely battle so we put a fresh pair of legs in with Jason Roberts.

'So in the end it worked very well.'