''I'm on track for the Ashes. I am improving with every game and every spell and I am happy with the way I am going. Other people can say what they like. People have to remember it is not easy for a fast bowler in India,'' McGrath had told 'Daily Telegraph'.
However, Thomson said despite all his efforts, McGrath will not be as big a threat as he used to be and whether the Aussies could bank on him would be clear after the first Test in Brisbane.
''I have said for the last two years that although he's been fantastic he is not what he used to be. I feel it is past his heyday but it is hard to judge him on what he is doing in India because they are playing on dreadful wickets. You have to see him back here,'' Thomson said.
''They have to give him a few Tests but the first Test in Brisbane will be very important. If he can't do well in Brisbane it's hard to imagine him scaring them (England) at any other venue because he does not bowl quick,'' he added.
Meanwhile, Aussie spin-king Shane Warne has come out in support of McGrath, saying that 'Pigeon' remains a force to reckon with and should not be judged on his recent one-day form.
McGrath has taken just six wickets in nine matches at an average of 37 since coming back to the team after a five-month break to with his wife during her cancer treatment.