The 30-year-old has not played a Test for England since last January in Australia because of continuing problems with his left ankle which was operated on for a fourth time in October.
However, he came though Lancashire's pre-season match against Yorkshire in Abu Dhabi, scoring 51 and bowling four overs.
"I would love to play a Test match at Lord's, but the one thing that I am not going to do is get carried away," Flintoff was quoted as saying on the England and Wales Cricket Board (ECB) Web site (www.ecb.co.uk) on Saturday.
"I know that if I want to play for England, then I have got to be fit. I won't be able to just walk back into that side.
"I have got to focus all my energies on playing for Lancashire. If I can stay fit and perform, then I would hopefully be in the shake up."
Flintoff said he still had some way to go to reach full fitness.
"Everybody tells me I am at 70 per cent, but I don't know - I might be at 72," he said. "I am certainly not hitting the crease as hard as I would like, but it feels good and easy."