Law 12: A direct free kick is awarded if a player commits any of the following offences against an opponent in a manner considered by the referee to be careless, reckless or using excessive force:
- charges
- jumps at
- kicks or attempts to kick
- pushes
- strikes or attempts to strike (including head-butt)
- tackles or challenges
- trips or attempts to trip
If an offence involves contact it is penalised by a direct free kick or penalty kick.
I’m not convinced that the challenge could have been described as careless, reckless or using excessive force, so I don’t see how a foul can be given, especially as football is a contact sport.