That’s because when he took Saints to Dens Park in March, they suffered the agony of losing to a last-minute Colin McMenamin winner.

And, while the Dark Blues boss was blasted by fans as his team lost 3-0 to First Division leaders Livingston last week, he is still expecting a tough game as Dundee look to bounce back.

“The criticism he’s had is unjust. Alex will be motivated tomorrow, but, having lost at home to Dunfermline and Clyde, we need to get back to winning ways at McDiarmid Park,” said Derek.

That support was appreciated, but, recalling their battles down south, Alex expects no favours.

“I think I’ve still got a scar on my calf from playing against Derek,” he laughed.

“He was a committed player and it is that level of commitment that’s taken him into management and will ensure his team is always hard to play against.

“If I remember correctly, the season I played against him for Wolves ended with West Brom. getting promoted — it would be nice if it happens the other way round this time.”

Dundee are set to give a debut to on-loan Rhian Dodds, while McMenamin could return to the starting line-up in a bid to end the recent goal drought.

For Saints, former Dundee man Gavin Swankie and defender Steven Anderson have recovered from injury and have been included in the squad.

And the manager is looking for the recent recovery that’s produced a win at Ross County and a draw at Queen of the South to continue.

“We need to back our good form up with a string of wins, and a derby match is ideal for continuing a good run of form and getting another win on the board.”

Meanwhile, a report that business man John Bennett will complete his proposed takeover of Dundee next week is way wide of the mark.

Bennett is out of the country until early October and, while he has held detailed talks with Dens chairman Bob Brannan, more discussion will be needed before a deal can be sealed.

Just as significantly, it’s understood Bennett remains undecided over whether he will proceed with the plan.