The Ukrainians are set to take on the Magpies at St James' Park in the first leg of their last-32 clash having not played a competitive match since December 12 due to the winter break.
And the 62-year-old coach knows his team cannot play poorly despite their recent inaction if they are to get beyond Alan Pardew's men.
"We have a 50 per cent chance of winning and Newcastle have a 50 per cent chance," Markevych told reporters.
"For us, it is very important to play a good game and if we do that, everything will be okay. But if we play badly, Newcastle will win."
|STEELY WIN FOR MAGPIES|
|22/1||Newcastle are 22/1 with Coral to beat Metalist 3-0|
Although the Newcastle's starting XI is likely to be packed with their latest French recruits, Markevych is expecting an English approach to the game.
"There should be no doubt here - this is an English team," he continued.
"The French players will help, but this is an English team and it will be a great pleasure for us to play against this English team, Newcastle United.