I'm so excited to see Sp*rs try extra hard against City just so they can prove that they didn't roll over for City. Of course, if they lose I'll accuse them of doing it anyway :)
I can't find anything specific that says you're not allowed to throw/sandbag, etc. but I think the 6th bullet of the Owner's Charter would allow the league to punish them:
"We understand the importance of a football pyramid that rewards success on the
pitch, upholds promotion and relegation and qualification for other competitions
by current sporting merit."
I think some people forget that these are athletes that have had one word seared into their brains since they were 5 - "WIN".