20According to settled case-law concerning Article 84(1) of the Rules of Procedure of the General Court, no new plea in law may be introduced in the course of proceedings unless that plea is based on matters of law or fact which have come to light in the course of the procedure. However, a plea which constitutes an amplification of a plea made previously, whether directly or by implication, in the original application, and which is closely connected therewith, will be declared admissible. To be regarded as an amplification of a plea or a head of claim previously advanced, a new argument must, in relation to the pleas or heads of claim initially set out in the application, present a sufficiently close connection with the pleas or heads of claim initially put forward in the application in order to be considered as forming part of the normal evolution of debate in proceedings before the Court (see judgment of 5 October 2020, HeidelbergCement and Schwenk Zement v Commission, T‑380/17, EU:T:2020:471, paragraph 87 (not published) and the case-law cited).