Highlighting values based on name and date

I'm working with a rostering system built in Excel. I need my roster to identify if a worker is in the standby list if they are alreay rostered to work.

As an example, if Robert Smith is working on Monday, I want a formula that will highlight every other cell in the 'Monday' column with his name in it. I need this formula to act upon the 'Monday' column of several pages in this workbook.

I'm aware this question is probably not detailed enough or very technically described. My apologies!

Cheers,

Alex

Please attach a sample workbook by showing the expected result for better understanding

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