To show why you need at least 4 first team midfielders when you play a 3 man midfield. Here is the number of mins JJ, McGinn & Luiz have played in Prem this season and the total mins played by all other players who played in midfield. So we need a Bissouma with Kamara, JJ & McGinn even in a season where nobody gets a longer term injury
JJ
2478
McGinn
3093
Luiz
2722
Other
1967