Northern Knights Head Coach Simon Johnston is currently in Australia working with Sydney Thunder.

The 44 year-old arrived at the weekend and will be shadowing Thunder Coach Trevor Bayliss on the short-term development opportunity.

David Warner, Simon Johnston and Trevor Bayliss - pic Sydney Thunder Twitter

Thunder face a local derby with the Sixers on Friday at the SCG, before travelling to Canberra to take on Adelaide Strikers on Sunday.

David Warner will be in the Thunder ranks, following his recent retirement from all international cricket.

Also in coaching action on Friday will be Gary Wilson, who is with Paarl Royals in the SAT20.