of course they can.
The maths on it are not even cheslea mad.
Bellingham 88.5mil and 250k a week.
Say you paid 200mil for mbappe with one year left on contract AND paid him 2million a week (not quite double saudi rate for ronaldo)
thats not even as mad as what Chelsea have done in the last 12 months.
Sure its just 2 players but its not madly out of line when you see their negative net spend for the last two years.
However it is entirely moot as mbappe says its psg smearing his name and he is going nowhere so it'll be 3 million a week in 12 months time. I don't know how he will survie the 12 months but i suppose 1mil a week gets baked beans or dog food to eat.