Notts County have agreed to sign four players, who have undergone medicals and will officially join on 1 July.
Mayo, Tann and Sam have all agreed to move to Meadow Lane
Versatile left-sided player Paul Mayo and defender Adam Tann, both 25, have rejected new deals at Lincoln City and Leyton Orient respectively.
Trinidad and Tobago international striker Hector Sam, 29, helped Walsall win the League Two title last term.
The fourth new arrival is 17-year-old goalkeeper Tim Sandercombe, who was recently released by Plymouth.
Tann previously had a six-game spell with County between November 2005 and January 2006, on non-contract terms.
"All these players, with the exception of the goalkeeper, have had experience of promotion or the play-offs in the last year or two," boss Steve Thompson told the club website.
County have already tied up the signing of former Scunthorpe midfielder Neil MacKenzie on a two-year deal, which was announced last week.
Earlier this month, Thompson released six players who had come to the end of their contracts at Meadow Lane.