yar just go buy a scrubby player for like $1k or $2k - there are heaps for sale.
ive had to do this myself. Im in the finals, and i booked a scrimmage (which i always do just in case i need to manage minutes )... but in the end i really didnt want my starters playing in the scrimmage at all, and some of my bench will clock too many mins, so ive gone out and bought two scrubs for a few thousand dollars.
It means i can manage the gameshape of my 'real' players so much easier, and it only costs me literally $3k in transfer plus salary for the guys which is nothing, another $4k in the end.
Some teams will do this almost all season, buy a scrub for a couple of weeks, then sell him, dependant upon Cup involvement, training, salary costs, injury, training etc etc etc.