The 43-year-old is currently competing in the hit BBC talent show and said he would love to get some more gritty parts in TV shows.
He said to UK newspaper The Sun: 'I think I'm capable of something gritty. I don't know if dancing the cha-cha will lead to a lead role in Spooks, though.'
Donovan added that the intensity of the show means he is finding it hard to relax.
According to UK newspaper The Sun, he added: 'I have an intensity on my face like the world's due to end. It's probably not the Saturday night image people want.'