It remains unclear whether the Houston Astros will be able to sign No. 1 overall pick Brady Aiken before Friday's deadline.

The two sides agreed to a $6.5 million bonus just two days after he was taken first overall on June 5.

Aiken flew to Houston on June 23 to take a physical and finalize a deal, but left two days later without a contract.

It has been reported that Aiken's physical revealed concerns about his elbow that put his deal on hold.