Rosberg doubts Hamilton was wise to break with Cullen

The 38-year-old Brit himself stated that he is still good with Cullen and that the two are still in daily contact via SMS. Cullen is still one of Hamilton's best friends.

Mercedes is having a tricky start to the season and for that reason thinks the desired effect is lacking for Hamilton. “I think that probably makes things even worse because even though the split apparently was amicable, you know, Angela was a real friend I think also to him," Rosberg told Sky Sports.

Things are going to change for the Mercedes driver and Rosberg argued that this may be going to have more impact than it first appears. "You end up also going to dinner in a very small, tight group with maybe a family member and a trainer and that’s it – and for Lewis not to have her as well, I’m sure it’s going to be not ideal, not so nice. I think probably that’s another challenge and difficulty that he has to deal with and get used to.”

At the moment, it is not known whether Hamilton has found a replacement for Cullen.