Jacobsen will on Saturday play his first match since suffering a torn calf muscle against Portugal in Scotlands tournament opener.

Alasdair Dickinson replaced Jacobsen in Frank Haddens squad once it emerged the injury would force him to miss the entire campaign.

But the 29-year-old is ready to return and Robinson believes Jacobsen - nicknamed Chunk - will be desperate to make up for lost time when he lines up for the capital club against Munster in the Magners League this weekend.

Robinson said: Chunk worked really hard to get himself tremendously fit for the World Cup before he picked that injury up.

Ive been told he is the best shape of his life which is tremendous and he hasnt let that go.

After the disappointment, it could have been easy for him to suddenly let that slip, but he has worked really hard.

Craig Smith is unfortunately out with a sore calf, so to have someone of the calibre of Chunk to come in was really pleasing for the squad.

Robinson keeps faith with fly-half David Blair, who again features in the same side as brother Mike after facing Connacht last week.

Roland Reid is unavailable for bench duty as his wedding takes place in South Africa.