...so I think they were maybe including Begovic in that.

Loanees Van Der Beek and El Ghazi will return to their clubs.

Sigurdsson, Delph, Tosun, Kenny and Lonergan will be out of contract (and Begovic would have been but has already been offered another year)

There are rumours that Delph and Kenny might be offered extensions as Lampard seems to like them but - as you said - Tosun has already agreed a deal elsewhere and I can't see Sigurdsson or Lonergan being retained