TV
The corporation has denied reports that the star is looking to quit the show, insisting that Tennant is "committed" to the show, and will stay until at least the end of the fourth series.
A BBC spokesman added: "When a further series is commissioned, we will be able to confirm his involvement."
The programme will return to screens this Spring, with Freema Agyeman replacing Billie Piper as Tennant's co-star.
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