We often come across multiple alternative dispute resolution (ADR) clauses inserted into a singular contractual framework. This poses great difficulty due to potential overlaps between the scope of each ADR method, which can result in jurisdictional conflicts. In this article, we analyse the interaction of arbitration and expert determination clauses, focusing on those scenarios where the broad jurisdiction of the arbitral tribunal appears to encompass disputes expressly submitted to expert determination. In this context, when a party submits a dispute to an arbitral tribunal and the other challenges its jurisdiction, it is well-known that the arbitral tribunal can rule on its own jurisdiction under the principle of Kompetenz- Kompetenz. In this regard, if the arbitral tribunal determines that it lacks jurisdiction to hear a case because it has been submitted to expert determination, the arbitral tribunal cannot rule on the merits of the matter, as it would constitute an excess of jurisdiction that could lead to the annulment of the award. In this case, in addition to dismissing the claim, the arbitral tribunal may suspend the arbitral proceedings until the expert issues their decision or even absorb the proceedings before the expert within the framework of the arbitration process. However, when a party submits a dispute to an expert, and the other party challenges its competence, the expert must decide on its jurisdiction, but such decision will be subject to revision by the arbitral tribunal.