Graham Potter has conceded Swansea City may pay a heavy price for their impressive 3-2 victory at Brentford through an injury to Martin Olsson. The Sweden World Cup full-back was carried off on stretcher with an Achilles tendon problem early on during the first-half of his team’s victory at Griffin Park. Olsson is due to have a scan to assess the severity of the injury, but the likelihood appears to be he will be sidelined for some time with Potter admitting: “It does not look good, to be honest.