Australia bowler Josh Hazlewood has turned up the heat on Jason Roy ahead of Thursday's Ashes opener.
Roy starred as an opener during England's triumphant Cricket World Cup campaign earlier this summer but question marks remain over his ability in the Test arena.
The 29-year-old has played 84 ODIs but only made his Test debut in the chaotic victory over Ireland last week and he is now set to be thrust into the deep end against Australia.
"We'll see how Roy goes in Test cricket. He has only played one Test match and it's a lot different opening the batting in a Test than a one-day game, that's for sure," said Hazlewood.
"In England, opening is probably the toughest place to bat which probably made Alastair Cook's record all the better. To play attacking cricket in those conditions is tough."
Roy made just five runs in his first Test innings before a skittish 72 helped England to an unconvincing 143-run win at Lord's.
The Surrey batsman, who usually bats in the middle order in the County Championship, has been warned nothing prepares you for batting at the top of the order in Test cricket.
Hazlewood added: "[Aaron] Finch found it tough last summer against a quality India attack on wickets that didn't do too much to be honest. I think he found it a big step up. He found the ball swung and seamed around and the wickets were a lot different to a one-day wicket.
"He'd played a lot of his four-day cricket at five or six and I think Roy is the same at Surrey. It's hard to bat five at a level below and then open in Test cricket. We'll see."