Their career choices have lead them into situations where the circumstances form a big obstacle for a possible move to a bigger team. For instance extending a contract with no limited transfer fee, but in return more job security and a better salary, but also a contract of which the last year of contract will start running at say when the player in question has already turned 29. Most of them were related to career choices; that's why we call choices that influence one's career a career choice. It's about club (which on itself contains many factors to consider, like whonthenmanager is, and whatbtheir transfer policy is, etc), age, value, contract length, salary, country, citizenship, league rules, limited transfer fees, bonusses, contract extension clauses, other clauses, et cetera. I would at least think a player and/or his agent is aware of what extending a contract at Fulham means for a player's career. Self reflection, bravo.