Jürgen Klopp will be bolstered by the returns of Alisson Becker, Roberto Firmino and Mohamed Salah from their breaks on Monday as the next stage of pre-season begins.
Keita and Shaqiri are set to join their teammates, too, with a view to featuring in Wednesday's friendly with Lyon in Geneva.
"Shaqiri and Keita as well, they already trained one session with us," Klopp told Liverpoolfc.com after Sunday's meeting with Napoli in Edinburgh.
"They are not here but they will come tomorrow because they train today. They will come tomorrow and should hopefully be a step further.