Tommi Makinen says he's in constant communication with Toyota Motorsport chiefs as he puts the final pieces of his team together for Toyota's highly-anticipated return to the World Rally Championship in 2017.

The former four-time WRC champion says he's taken full responsibility of Toyota's re-entry into WRC with his team Tommi Makinen Racing, with a deadline to commence operations in the middle of August.

Due to the redraft of WRC regulations for 2017 Makinen is looking to revolutionise the Toyota challenger which will be based off of the 2015-spec Yaris with Toyota Motorsport GmbH developing a new engine.

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Makinen confirms the team will initially begin work at its current base in Puppola, Finland but insists it will need to find a bigger base to work from which is yet to be decided on.

"It's a big project, everybody realises that, and I need good people around me," Makinen told WRC.com. "Trying to find them and build our organisation is where we are at the moment. So far it seems very positive.

"Our design team is already there but we have to keep employing people. Our plan is to start working in the middle of August. As we keep bringing on more people, I hope that we are flat-out for the beginning of September.

"Everybody knows our time schedule is a big challenge - the biggest one in fact. For this reason we will start our programme, including the design phase and building prototypes, in our current location in Puuppola. But we know that we need more room for further operations. Whether that is in Finland or somewhere else is yet to be decided."

The Finn also confirmed former Subaru World Rally Team engineer Michael Zotos has joined the programme and will become a focal point of the engineering squad.

Maikonen gave a rough timetable for the team's operations ahead of its 2017 return and expects live testing to commence by March 2016 with a finalised specification completed by October 2016.

Toyota Motor Corporation president and CEO Akio Toyoda confirmed the Japanese manufacturer's return to the WRC at the start of the year, ending a 17-year absence from the championship.