Bolt was offered a two-year contract from Maltese club Valletta, which he turned down on 18 October 2018. On 21 October 2018, Bolt was offered a contract by the Mariners. The Australian FA was helping the Mariners to fund it. Later that month, Perth Glory forward Andy Keogh was critical of Bolt's ability, stating his first touch is "like a trampoline." He added Bolt has "shown a bit of potential but it's a little bit of a kick in the teeth to the professionals that are in the league."