Using PH0 & PH1 on DISCO-L053C8

I am using Mbed-OS 5.15.6 under the Mbed Studio and my target is DISCO-L053C8 (STM32L053C8T6). PH0 and PH1 are GPIOs as per the chip datasheet. On the DISCO board I can see PH0 (OSC-IN) connected to the MCO for a clock. Nothing happens on those two pins if I use them as GPIO. Can I use those as GPIOs by changing the configuration?