Hearts sports director Anatoly Korobochka has called on Spartak Moscow to beat Celtic this week to avenge the Jambos' 5-0 thrashing on Saturday.
Korobochka, a former player and coach with CSKA Moscow, told a Russian newspaper that he would offer Spartak his "sincere support" when they visit Glasgow for the second leg of the Champions League third qualifying round tie.
"Spartak are strong enough to overcome Celtic," said Korobochka. "The important thing for them is not to concede an early goal and to play positively on the counter. We created three good scoring opportunities in our match, but did not take them.
"Celtic will give Spartak a fight, so the Russian team should be fast with their passing and press the ball constantly so that the Scots won't feel in control.
"I wish my friends from Spartak the best of luck and I will sincerely support them on Wednesday night. Celtic offended us and I would like it to be avenged."