"The first thing Federer must do is ensure that his girlfriend returns to being just that. It is a simple matter of common sense. The whole thing could end in tears. He is too talented to let his career fall apart."
Vavrinec was equally forthright when she spoke to Standard Sport at the Australian Open. She said: "I think that Cash should just shut up.
"No one can understand what his problem is and
I don't know why he is writing this stuff. It hurts when someone says things like this and I don't know where he got these ideas because I don't know him and I haven't met him.
"I have been with Roger for four years. Maybe if I was a crazy, disco-dancing girl who dragged him away to go shopping all the time after having known him for just a year then Cash's comments may have been understood. But I am the complete opposite of that."
Vavrinec said Federer's parents managed his affairs and her responsibilities revolved around publicity, travel arrangements and handling the perfume that Federer launched after his Wimbledon triumph called "RF - Roger Federer".
She said: "I book the hotels and flights and look after the perfume business but his parents manage his affairs. Having played tennis I know what it means to be fit and well for the game and I can be a help for him. "Maybe Cash had some bad people around him during his career and that's why he is saying these things. I think he is just jealous and that's why these comments have been made.
"He has also said things about Greg Rusedski and Lleyton Hewitt, yet he still goes into the players' zone.
"He must be unhappy with his own life to say these things. It shows so little respect.
"Roger is only at the beginning of his career and you would have thought that someone like Cash, who has achieved a lot, would want to give young players help and advice, not these kind of comments.
"I would not like to be in Cash's position in the media when he comes up to Roger and asks for an interview."
Federer has also been riled by Cash's comments. He said: "People have told me what Cash said and I cannot believe it. Everything he said is not true. I don't even know Cash and, as long as that's the case, I cannot take it seriously.
"I know what is true and what he is saying is definitely not right. It's not fair.
"I am looking for a coach and I am trying to make the right decision and it is probably going to take a few weeks and months.
"I think it would be a good challenge for any coach to work with me. I am, maybe, different to the other guys on tour.
"It was difficult to start the year without a coach but that was my decision and something I had thought about for a long time. It's not something that came up after Houston (where he won the Tennis Masters Cup in November). It was already going on for half a year or something."
