Why Guardiola will be sending thank you message to Mourinho

The article suggests that Pep Guardiola will feel indebted to Jose Mourinho for an as-yet-unspecified reason, prompting a 'thank you message.' Given the context of coaching rivals, this is likely an opinion or analysis piece discussing a recent tactical development, result, or event that benefited Guardiola's team due to an action taken by Mourinho.