Nico Rosberg News
Hamilton, heading for his sixth title this season, made his comments after Red Bull`s Max Verstappen hit back at criticism from Rosberg, who is now a Sky Sports television pundit and YouTube blogger.
Alonso's plans for 2020 looks set as he will participate in Dakar Rally for Toyota.
Hamilton`s path to his fifth championship started slowly last year, with his first win not coming until the fourth race in Azerbaijan.
Rosberg, who is also a Laureus ambassador, had announced a shock retirement five days after winning his maiden title in 2016, when he pipped fierce rival and teammate Lewis Hamilton.
Former Mercedes driver Nico Rosberg has said that four-time Formula One champion Sebastian Vettel is much more superior in terms of dedication towards work in comparison with his former team-mate Lewis Hamilton.
Hamilton has not won since last year`s U.S. Grand Prix in October, a run of six without standing on the top step of the podium.
Raikkonen`s best time of 1min 20.872 came late in the day in Barcelona as the track dried out after trucks dumped water on the surface overnight and again during the lunch break.
Canadian rookie Lance Stroll got back into the Williams after an early spin on Tuesday damaged the car and ended his first day of testing, completing 98 laps.
Hamilton said on Wednesday that technical changes caused by wider, bigger and faster cars could actually decrease rather than increase the amount of overtaking that Formula One fans so enjoy.
The German marque has up Williams driver Valtteri Bottas as Lewis Hamilton`s new teammate for the forthcoming Formula One season.
Mercedes are due to unveil the new car at Silverstone on Feb. 23 with the season starting in Australia on March 26.
The Stuttgart-based Mercedes were left scrambling round for a second driver when Rosberg dramatically retired on December 2 just five days following his drivers` title triumph.
The winners, as voted for by members of the Laureus World Sports Academy, will be revealed in Monaco on February 14.
Meanwhile, Hamilton has insisted that his team must consult him on who would replace Rosberg next season.
The delay will ramp up speculation about who will take the vacant seat alongside Lewis Hamilton at Mercedes following world champion Rosberg`s shock retirement earlier this month.
Earlier on Sunday, Mercedes non-executive team chairman Niki Lauda said that he expected Nico Rosberg's replacement to be announced before the end of the year.
The 31-year-old Mercedes driver just won his first Drivers' championship title on Sunday at the season finale Abu Dhabi Grand Prix.
The three-time world champion Briton took to Twitter on Wednesday to ease any lingering tension between the two men.
Hamilton won 10 out of 21 races this season - the first time a driver has won more than seven and not ended up as champion -to Rosberg`s nine.
Hamilton ignored two instructions from the team to increase his speed at the front, but was unable to create a situation in which Rosberg could be attacked and passed.
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