An extension affects more than the length of the contract. It normally also determines remuneration during the additional period. Fixed salary, appearance and performance bonuses, accommodation or vehicle benefits, insurance and travel arrangements may be governed by different provisions. A reference to “the existing terms” is not enough if individual elements are meant to change.
A scale may refer to appearances, league, table position or another objective value. It then needs a clear calculation: which period is measured, when does the entitlement arise, and how is an interrupted season treated? If a new fixed amount applies, its start should match the start of the extension period.
Payroll can provide evidence but does not replace an effective contractual amendment. Continuing payments do not by themselves prove that an option was exercised. Conversely, a different payroll entry does not necessarily change an already concluded contract. Read the wording, notice and payment flow separately.
The contract check can help sort term, remuneration, duties and missing documents before a discussion. It does not interpret the specific option clause.