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Celtic face a formidable task when they welcome Bayern Munich to Glasgow on Tuesday, but can they spring up an upset?
Our tipster Brad Walker (@brad_TWalker) has combed over the fixture to pick out a tidy 9/1 double ahead of kick-off.
The Canadian defender has made 21 tackles so far in the Champions League, averaging 2.63 per game.
Johnston's tenacity has already seen him receive two yellow cards in the competition this term and he will be walking a tightrope against Bayern Munich winger Kingsley Coman.
The tricky Frenchman has pace in abundance and has also completed 14 successful dribbles in Europe.
Emphasis will be on the Bayern wide players to break down their stubborn hosts, meaning Johnston could be in for an eventful evening at Celtic Park.
Given Bayern have averaged a whopping 69% so far in the competition, the Glaswegians can expect to be without the ball for large spells.
The visitors' strengths in retaining the ball will only place extra emphasis on the hosts to breakup play and stem Bayern's momentum wherever possible, particularly in midfield.
Add in the nine fouls committed by Celtic midfielder Arne Engels in the Champions League and a yellow card for the Belgian all of a sudden looks a likely proposition.
No player has given away more fouls for the club in the competition this season.
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