England bowling coach Jon Lewis says Ollie Robinson must improve his fitness after the seamer suffered a back injury on day of the final Ashes Test in Hobart.

Robinson missed the fourth test in Sydney with a shoulder injury, but he made an immediate impact after being recalled at Blundstone Arena, removing both David Warner and Steve Smith for nought as England decimated Australia's top-order during a blistering start.

However, after reducing the hosts to 12-3, England were left frustrated as Travis Head's 101 led an Australian fightback, with Robinson only able to bowl eight overs.

Speaking at the close of play with Australia 241-6, Lewis stated that Robinson must give himself a better chance of staying injury-free.

"It’s definitely something to work on," Lewis responded when asked about Robinson's conditioning. "It’s something he needs to improve. He’s got a record of playing a lot of games in county cricket. 

"But international cricket is a higher intensity, and you play all year round. So he’s got to get used to understanding what it takes to be a full-time, year-round international cricketer.

"Is it a concern? It’s one of the things he really needs to work on. He’s shown over the course of the English summer, and this series so far, that he can put back-to-back games together. But there’s definitely areas he needs to work on for sure.

"It’s something he will need to do if he’s going to perform consistently over a long period of time, he’ll need to be a fitter bowler, 100 per cent. We've had those conversations with him and been pretty frank with him, and now it's up to him to go and do the work."