The former Wales coach has claimed Jurgen Klopp and Antonio Conte's training methods ruin players.
The two sides are currently in the midst of their pre-season routine as they look to build up their fitness ahead of the new campaign.
Both managers are known to favour a focus on intense physical conditioning in pre-season as it helps the style they want their teams to play.
So far there have been no major injuries for either side, but Verheijen has taken to Twitter to criticise both managers, claiming they are destroying players with their out-dated methods.
In past weeks media reported how intelligent coaches like Conte & Klopp do 'too much too soon' with double & triple sessions in pre-season.— Raymond Verheijen (@raymondverheije) July 18, 2016
Coaches destroy players by training too much too soon in pre-season in 3 phases:— Raymond Verheijen (@raymondverheije) July 18, 2016
1) fatigue phase, 2) injury phase & 3) injury crisis phase.
In about 2 weeks the first teams will enter the 'Injury crisis phase' (phase 3). Look forward to all these coaches blaming external factors.— Raymond Verheijen (@raymondverheije) July 18, 2016
In meantime ask yourself a question: why do we no longer fly in planes of 30 yrs ago but do intelligent coaches still train like 30 yrs ago?— Raymond Verheijen (@raymondverheije) July 18, 2016
Verheijen’s views are certainly interesting given that Liverpool’s players have largely praised the high intensity method employed by Klopp.
They have openly admitted that it is tough but the improvement in their conditioning was notable across last season because it was embraced.
Of course, this is not the first time the former Wales coach has criticised the Reds manager, having done so last season, and it will be interesting to see if he is proved right in the next two weeks.