Jan Vertongen is still finding his feet at the club and the position that is best for him, I cant see him being made Captain not at this point, in the future who knows.
Of the established THFC players for me its either Dawson, Kaboul or Parker for the role or maybe even Brad with his vast experience and approach would be a good option.
On that note cant see Lloris wanting to stick around much longer he didnt come to sit on the bench!