Liverpool have the sixth-most active senior internationals of any club in the Premier League, according to the CIES Football Observatory.
The study showed that 50 percent of the Liverpool squad made an appearance for their international sides this year.
This leaves the Reds sixth in terms of active internationals in the Premier League.
Only 39.3 percent of Merseyside rivals Everton‘s squad played for their national team this year.
Europe-wide, Liverpool are the 15th-most successful team in terms of development senior internationals, ahead of Roma (48.1%), Napoli (48.1%), Borussia Dortmund (48%), Bayern Munich (47.8%) and Porto (45.8%) in the top 20.
Only nine of Jurgen Klopp‘s squad were called up for international duty this week, with Simon Mignolet, Christian Benteke, Emre Can, Joe Allen, Martin Skrtel, Adam Lallana, Joe Allen, Nathaniel Clyne and Adam Bogdan all selected.
However, this is largely due to a number of debilitating injury issues within the German’s ranks.
Lining up at Melwood, Liverpool took on a Wolves side that included former Reading and Cardiff City striker Adam Le Fondre.
With Coutinho scoring twice and Firmino adding another, the Reds ran out 3-2 victors.
Klopp used this opportunity to oversee the development of loan stars Sheyi Ojo and Sergi Canos, who both came on as substitutes, with Ojo providing the assist for Coutinho’s second.
Eighteen-year-old summer signing Allan also featured, assisting on Coutinho’s first, while U18s captain Trent Alexander-Arnold supplied Firmino with an easy finish after a lung-bursting run from right-back.