Cycling Ireland has confirmed that Philip Deignan will miss the World Road Race championships as a result of the fractured collarbone he suffered yesterday.

The Letterkenny cyclist suffered the injury in a fall during Tuesday's time trial at the Tour of Britain and will undergo surgery tomorrow.

The UnitedHealthcare rider hit the deck approximately four kilometres from the end of the time trial, causing him to go over the handlebars and suffer the shoulder injury.

Deignan had previously been selected as one of three named riders for the worlds in Florence, Italy, joining Nicolas Roche (Saxo Tinkoff) and Dan Martin (Garmin Sharp) on the squad. 

22-year-old Sam Bennett has been named in one of the two remaining slots with the remaining place on the team will be taken up by Matt Brammeier.

Meanwhile, Mark Cavendish won today’s stage four of the Tour of Britain, with fellow Briton Bradley Wiggins remaining top of the general classification.

The Omega Pharma-Quickstep rider triumphed in a bunch sprint at the end of a challenging day that took the race from Stoke-on-Trent to Llanberis.

An 11-strong breakaway had operated out on its own for most of the day but was reeled in with just one kilometre remaining in the Snowdonia National Park.

That brought Cavendish into his own and he was able to see off the challenge of stage one winner Elia Viviani (Cannondale) and Steele Van Hoff (Garmin Sharp).

Bennett finished in tenth spot for the scramble to the line in the same time as Cavendish while Wiggins, who powered his way to the gold jersey with a dominant performance in the stage three time trial, finished in the peloton to stay in front with four stages to go.

Bennett sits in 62nd spot overall, eight minutes 32 seconds behind Wiggins.