By Jamie Spencer La Liga president Javier Tebas has warned Barcelona to cut their wage bill because the economic levers that have provided a financial lifeline this season will be no good to them next season. Having gone through a squad overhaul in the summer, Barça were left needing to raise considerable funds in order to register their various new signings and contract renewals as a result of their heavily restricted spending power under La Liga’s finance rules. Economic ‘lever’ became a buzz word surrounding the club during the summer. Each time they triggered another lever, it would signal…