Mitt Romney will spend this upcoming week preparing for his debates against President Obama, according to reports.

According to a campaign source, Romney will go head-to-head against Sen. Rob PortmanRob PortmanHillary gives Bernie cool reception at Trump inaugural lunch GOP governors defend Medicaid expansion Senators introduce dueling miners bills MORE (R-Ohio) who is standing in for Obama to help prepare the GOP candidate, CNN first reported.

Senior Romney adviser Kevin Madden said that Romney would hold the debate preparations at the Vermont home of former Massachusetts Lt. Gov. Kerry Healey (R), a campaign surrogate, from Tuesday to Thursday.

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Reports said Romney’s campaign had not decided if the candidate would hold any public events this week, as Democrats meet in Charlotte, N.C. for their convention.

Romney and Obama will face off in three presidential debates this fall. 

PBS's Jim Lehrer will host the first debate on Oct. 3 at the University of Denver. CNN's Candy Crowley will host the second debate at Hofstra University in Hempstead, N.Y. on Oct. 16 and CBS's Bob Schieffer will moderate Oct. 22 at Lynn University in Boca Raton, Fla. 

Romney campaign sources confirmed last week that Portman, who was reportedly considered for the GOP vice presidential pick, had been tapped to play Obama during mock debates. 

Portman also played Obama in 2008 to assist Sen. John McCainJohn McCainA closer look at McCain's proposed defense budget Top Dem comes out against Tillerson ahead of key vote Is McCain confident in Trump? ‘I do not know’ MORE’s (R-Ariz.) presidential bid.

The Obama campaign is using Sen. John KerryJohn KerryWeek ahead: Early questions for Trump on cybersecurity Kerry and his dog stroll through women's march Trump fails to mention Clinton in inaugural address MORE (D-Mass.) to play Romney in Obama's debate prep and ranking House Budget Committee member Chris Van Hollen (D-Md.) will play Rep. Paul RyanPaul RyanPlanned Parenthood president warns of health crisis for women if ObamaCare is repealed Juan Williams: Ethics cloud hangs over Trump This week: Congressional Republicans prepare to huddle with Trump MORE (R-Wis.) in Vice President Joe BidenJoe BidenBiden boards train home to Delaware after Trump's inauguration Overnight Tech: Meet the key players for Trump on tech | Patent chief staying on | Kerry aide goes to Snapchat | Uber's M settlement Biden's farewell message: Serving as VP has been my 'greatest honor' MORE's practice sessions. 

Earlier this week, Portman said that in his experience, mock debate sessions can often get heated. 

“You kinda swing back and forth — I mean, nothing physical, although it's come close at times,” said Portman, during an interview.