Max Eisenbud reacted angrily after world number eight Agnieszka Radwańska of Poland said she believes Sharapova should not receive wildcard entries for the next two Grand Slam events - the second of which is Wimbledon in London in July - as she prepares to return from a 15-month doping ban.

He also hit out at Denmark's Caroline Wozniacki, who was critical of Sharapova being giving a wildcard entry for her comeback tournament in Stuttgart next week.

"All those 'journeyman' players like Radwańska and Wozniacki who have never won a slam and the next generation passing them," Eisenbud said in a statement tweeted by Ben Rothenberg, a United States-based tennis writer and podcaster.

"They are smart to try to keep Maria out of Paris."

He went onto claim it is Radwańska and Wozniacki's "last chance" to win a Grand Slam, pointing to the absence of pregnant world number two Serena Williams, Czech Republic’s Petra Kvitova and Belarus’ Victoria Azarenka, who is expected to return in July after having a baby.

Sharapova is due to find out in the week beginning May 15 if she will be able to compete as a wildcard at the French Open, seven days before the event is scheduled to begin. 

Radwańska, who has beaten Sharapova only twice in 15 attempts, believes that type of entry to this year's second Grand Slam tournament should not be possible for the Russian.

"This kind of entry into the tournament should apply to players who dropped in the ranking because of injury, illness or some other random event," she told Poland's sports daily Przeglad Sportowy.

"Not for those suspended for doping.

"Maria should recover some other way, starting with smaller events.

"So far she hasn't been invited to slams in Paris and London and in my opinion that's how it should remain.

"She should win her spot by playing well."

Earlier this month, Sharapova criticised the International Tennis Federation (ITF) for not doing more to inform her that meldonium had been added to the World Anti-Doping Agency (WADA) Prohibited List. 

The 30-year-old claimed in an interview with The Times that the authorities knew she was using the drug when she competed for Russia at the Fed Cup in November 2015.

Meldonium officially became a banned substance two months later, which came after WADA had been monitoring the substance.

The ITF has denied the claims in a statement sent to insidethegames.

Sharapova was initially banned for two years for testing positive at the Australian Open in January 2016, before it was reduced to 15 months following an appeal to the Court of Arbitration for Sport.

She admitted she was responsible for the failed test and was "complacent" when dealing with the issue.

Sharapova will also not have to pre-qualify for events in Madrid and Rome.