There is a hidden attribute called professionalism that determines how hard a player is willing to work in training. The players you mentioned must have a low number in this attribute.
Personally I don't bother creating new schedules for these players and it doesn't seem to cause any issues other than the initial "unhappy with training workload" that you currently see. I tend to get rid of these lazy players as soon as possible.
There are some articles about training in our guides section that you might want to take a look at if your thinking of making some schedules and want to understand how training on FM works as a whole. current guide section
Some training articles
http://www.fmscout.com/a-fm12-training-and-match-preparation-guide.html
http://www.fmscout.com/a-FM11-Guide---Training.html
Personally I don't bother creating new schedules for these players and it doesn't seem to cause any issues other than the initial "unhappy with training workload" that you currently see. I tend to get rid of these lazy players as soon as possible.
There are some articles about training in our guides section that you might want to take a look at if your thinking of making some schedules and want to understand how training on FM works as a whole. current guide section
Some training articles
http://www.fmscout.com/a-fm12-training-and-match-preparation-guide.html
http://www.fmscout.com/a-FM11-Guide---Training.html
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