BOSTON (AP) — The Boston Symphony Orchestra and its musicians have decided to extend their collective bargaining agreement for 48 hours, a sign they could be nearing a deal to head off what would have been the first strike in the ensemble’s 145-year history.

The Boston Musicians’ Association said Saturday it had authorized a strike ahead of the expiration of the union’s three-year contract at 11:59 p.m. Sunday. The BSO and the musicians said Sunday the contract had been extended to 11:59 p.m. Tuesday.

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BSO CEO Chad Smith said Sunday that the extension had been agreed to pending a ratification vote by the BMA and the Boston Symphony Orchestra Players’ Committee.

The orchestra and management have had strained relations since BSO decided in March to force out music director Andris Nelsons next summer after 13 seasons.

The orchestra’s season is scheduled to open Sept. 17.