Watford centre-back Kevin Keben is set to make his comeback in "at least" one of their games over the Easter weekend.The 21-year-old Cameroonian has not played since suffering a "long-term muscle injury" in the 2-0 derby win over Luton Town on 23 February.The club say his injury has been "vulnerable to setbacks" so he has been "carefully managed" over the last few weeks.Watford, who are seven points outside the play-off places with four games to play, are at home to second-placed Burnley on Frid