It will be the first time summer signings Chris Dagnall and Bobby Grant have met their new teammates.
They are the only arrivals so far this summer, despite Paul Hayes, Marcus Williams, Grant McCann and Matty Sparrow all leaving on free transfers after turning down contract extensions. Ben May, Peter Winn and Jake Picton were released.
Questions also remain over Gary Hooper, who was top scorer last season and has been widely linked with a £2.5million move away from Glanford Park. Middlesbrough are said to be leading the chase.
Of the out-of-contract players offered terms the club have yet to confirm if two players have accepted.
One is forward Jonathan Forte, who was a peripheral figure in the first-team last year. Although he made 34 appearances, 24 of them were off the bench. He scored three goals.
The second is centre-back Kenny Milne.
The first-team squad will focus on building up fitness this week before heading to a health resort at Ashby de la Zouche in Leicestershire next week.
They will return in time to kick-off their pre-season with trips to local non-league sides Bottesford, Brigg and Winterton.