Midfielder Sylvestre has also played for Sparta Prague and has signed a two-year deal at Bloomfield Road with an option for a third year, as has winger Grandin.
Fellow midfielder Martin is a former French youth international and has signed a one-year deal after impressing on trial following his release by Monaco.
Harewood impressed on a recent trial with the club, whose players were only given their bonuses for winning promotion from the Championship on Tuesday.
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