By SABC Sport
7th February 2024
The South Africa-born forward will also be unavailable for his country's encounter with Italy later this month after his sending off during last Friday's tournament-opening defeat against Ireland.
The punishment was issued following an independent disciplinary committee hearing on Tuesday.
Willemse was shown two yellow cards for foul play during the 38-17 loss, the second of which was later upgraded to red.
He was given suspensions of four weeks and three weeks for the offences, to run concurrently, meaning a ban of four weeks.
He can further reduce the ban to three weeks by applying to take part in World Rugby's coaching intervention programme - the so-called 'tackle school'. He also has the right to appeal.
Willemse could have faced a longer suspension but while the committee found his actions "reckless", according to a statement, they accepted "there was no evidence to suggest the player acted maliciously or with intent in either case".