Lewis has not done a heptathlon for almost three years

Lewis has not competed in a heptathlon since her Sydney 2000 triumph, after taking time out for the birth of her daughter.

But the 30-year-old is back in full training under the guidance of Frank Dick, who began coaching her last summer.

The meeting in Tallinn will give the first major indication of her progress as she sets her sights on retaining her title in Athens next year.

I think she can break her personal best in the future Denise Lewis' coach Frank Dick

"We'll find out a lot more after the European Cup," said Dick.

"I don't think she will be in the kind of shape to set a personal best this year.

"But I think she can break her personal best in the future and the aim is to try and get her in PB shape for next year."

Lewis divides her time between her home in Belgium, which she shares with partner Patrick Stevens and daughter Lauryn, and her north London home.

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Her former coach Charles van Commenee officially resigned his position shortly after the birth as he was concerned she would not have the drive to make it back to the top.

Dick admits Lewis suffered a few setbacks in her quest to return to full fitness after two years away from athletics.

But he said: "I know she is in reasonable shape because of a session she does pulling a 7.5kg sled behind her over 60m," Dick told Athletics Weekly magazine.

"The time differential between the running with and without the sled is about a second, which is good.

"Some would say it should be closer to 0.6 seconds, but she will develop her absolute strength.

"I think of the speed component first and then develop the strength component."