The Official Online RBS 6 Nations Store is open. The store has everything you need to get behind your team during the RBS 6 Nations, plus the store is now fully stocked with a much wider range of rugby merchandise.
With Riki Flutey still battling a calf injury, Johnson was forced to act when club-mate Dominic Waldouck suffered a facial injury in their LV= Cup clash with Bath at the weekend.
Allen isn’t expected to start against Samoa but could be included on the bench in the hope of adding to his tally of caps for the first time in four years.
Allen – whose previous Test appearances came against Argentina and New Zealand - joins an England squad high in confidence having inflicted a 35-18 thrashing on old enemies Australia last week with Chris Ashton scoring twice.