At every one of your clubs, but especially the highest level UCL sides, backup players often believe they deserve more minutes and believe they are of the level to challenge for trophies when in reality the sporting director selected them to fill the 15 percent of minutes during the season.
Look at the recent league fixtures of Paris st G, Bayern and Atleti's and it is amusing how subpar the reserves play, it blatant they are all of mid to lower table starting quality, although in all these cases of course match rhythm and inexperience is to be expected, it's funnier when prime big reputation individuals are caught lacking, and are forced to humble themselves on the national stage.
Almost as if the coach doesn't need to say nothing, their performances speak for themselves, 'See boys, that's why you barely play and need the big dogs to rescue the match from the 60th minute'.
Wouldn't even be too far to quote names and examples, but they are easy to find, this is not a recent phenomenon but remains one of the most interesting psychological dynamics in sport' even quoted by a Drake lyric