Lehmann, who replaced Mickey Arthur in a hasty reshuffle by Cricket Australia just over a week ago, had already suggested that Watson would be returning to the top of the order and on Monday named Rogers as his partner.
At the age of 35, Rogers has just one Test cap to his name, scoring 15 and four against India in 2008.
The news means David Warner, banned until the start of the first Test at Trent Bridge on July 10 after punching England's Joe Root in a Birmingham bar, is unlikely to feature.
Rogers' advanced years do not seem to concern Lehmann, who told Sky Sports News on Monday: "You can always improve, whatever age you are.
"That's what we want to do, learn and get better, and if we can keep doing that on and off the ground we'll be fine."
Lehmann has made five changes for the Worcestershire match, bringing in Rogers for Usman Khawaja as well as replacing Peter Siddle, James Pattinson, Nathan Lyon and Mitchell Starc with Jackson Bird, Ryan Harris, Ashton Agar and Steven Smith.
And while he has confirmed his top two batsmen, he revealed there was still some room for players to force their way into his first XI this week.
"There's not many (question marks) now, we're pretty comfortable with it," he added.
"We're pretty close. It's one or two (places) and we'll work those out over the next four or five days.
"We'll make sure everyone gets the best chance to forward for selection for the first Test."
Lehmann accepts that England will start the series as favourites after a troubled run of form for Australia under Arthur, but his assessment came with a sting in the tail.
"We deserve to be underdogs to be fair," he said.
"England have been pretty good for a long period of time. We have to play our best, we know that, but it'll be a tighter series than everyone thinks, I reckon."