The Hoops midfielder has witnessed Gary Hooper and Victor Wanyama march out of Celtic Park over the summer with Neil Lennon unable to bring in a new striker ahead of tomorrow's play-off first leg with Shakhter Karagandy.
However, buoyed by Saturday's 2-0 win in Aberdeen, Kayal has pin-pointed Celtic's togetherness and will to fight for each other as the secret weapon against the Kazakhs.
"We have lost some very good players but we are a strong squad," he said.
"We work hard and we fight for one another and we know that we have to have that strength of togetherness going into the game tomorrow night.
"We are a team with a lot of spirit. The manager wasn't able to bring in any new players in time for the game, but we have enough. We are good enough.
"This is the biggest game of our season. We know that and we are ready for it.
"We know how important it is to us, to the club and to the fans. We are ready to give it our best."
New centre-back Virgil van Dijk was able to get some game time under his belt at Pittodrie, while Steven Mouyokolo also made an impression.
"They are both experienced players so it is not like they do not know what it is like to play at this level," said the Israeli. "They are both excellent players.
"They will have benefitted from playing on Saturday and it is up to the manager now what team he puts out."
And Kayal is well aware of the importance of making sure Celtic try and keep a clean sheet ahead of the return leg in Glasgow.
And he expects the Hoops to have the ability to grind out another good result on the road to make life easier when the Kazakhs come to town next week.
"We know what it takes to go away and win or get a decent result," he said. "We don't know what to expect in Kazakhstan but the manager has worked hard to prepare us. We have watched DVDs and we know what we have to do.
"It is different playing European football. You have to be very disciplined and you have to work hard always to try and keep the ball.
"We know it might be a hard 90 minutes but if we can keep a clean sheet then we will have every chance of getting the right result when we play them in Glasgow next week."