Robbie Williams feels 'dreadful' for letting his fans down after he was struck down with food poisoning - forcing Take That to cancel a concert.

The 37-year-old singer posted a message from his sick bed in Denmark after he came down with the illness which resulted in the band calling off their performance at Copenhagen's Parken stadium on Saturday night (16.07.11).

Posting a photo of him with a drip, Robbie wrote on his blog: "Hey folks. Thank you for your messages and love. I'm not completely out of the woods yet but feeling much better. Gutted for everyone involved with the tour.

"Feeling dreadful for letting the fans down. I'm so, so sorry. Here's me and my drip."

Robbie got food poisoning after eating a "dodgy lobster", and he needed a drip after suffering from dehydration because he lost so much fluid.

A source said: "It hasn't been pretty. It's all down to a dodgy lobster he ate at a hotel.

"Jason and Mark wanted to go ahead and do it without him, so as not to let down the fans.

"But there was something to do with the insurance that stopped them.

"I think they would have had to pay back on the tickets if people there said they wanted to see Robbie and they'd done the gig without him.

Take That ' who are scheduled to play in Amsterdam, The Netherlands, tonight (18.07.11) - released a statement revealing it was a "horrible decision" to cancel the show, but they thought it would be "wrong" to perform with one member missing.

The group ' Gary Barlow, Mark Owen, Howard Donald and Jason Orange ' released a statement saying: 'We are truly devastated to have had to cancel tonight's show in Denmark. This is the first show that we have ever had to cancel in our career as a band. It was a horrible decision to make and one we agonised over.

"In the end we felt that as this tour is about the five of us being back together, and about celebrating that reunion, it would be wrong to go ahead with the show."