Crewe manager Dario Gradi fears Michael O'Connor will miss the start of the new League One campaign due to injury.
The midfielder limped out of The Alex's pre-season friendly win over Quorn on Tuesday evening.
O'Connor collected an ankle knock and Gradi would be surprised if he recovers in time for their season opener against Northampton on August 5.
"Michael's going to be out for a few weeks," confirmed Gradi to the Sentinel.
"I will be surprised if he is back for the start of the season."