Dominik Szoboszlai and Virgil van Dijk have played the second-most minutes of any outfielder in Europe’s top five leagues, with the pair flying dangerously close to the red zone.If you had to choose one player who was currently irreplaceable for Liverpool, it would be Szoboszlai.A tireless and selfless player who has already been tasked with occupying several positions, Szoboszlai has been the shining light in an otherwise dour campaign to date.Such has been his influence, he has already accumulated 1,980 minutes for Liverpool this season, which rises to 2,520 when you factor in his minutes for Hungary.As per FotMob, the 25-year-old has started and completed the full 90 minutes in 21 of the Reds’ 23 matches to date, which is an involvement of 91.3 percent.The only other player to match his output? Van Dijk.Only Genoa’s Johan Vasquez has played more minutes as an outfielder in Europe’s top five leagues than the Liverpool duo, and that is due to playing a game more.Szoboszlai and Van Dijk have had a mirror season so far, playing 1,980 minutes at club level and a further 540 for their country.While not unsurprising as respective captains for their country and key figures at Liverpool, they are numbers which ought to have Slot and his staff on alert.It is not even mid-December and Liverpool already have four players with over 2,000 minutes under their belt, with Ibrahima Konate (2,122) and Cody Gakpo (2,047) joining Van Dijk and Szoboszlai.Slot has leaned on the quartet heavily and his reliance on them has already seen Gakpo ruled out for a number of weeks with an injury, with fears the same could later extend to the others.The lack of rotation during matches, Konate aside, only increases the likelihood of bodies breaking down, and it is not as if Slot has a deep squad to turn to.Speaking after the defeat at Galatasaray, Slot explained: “I like my squad so much, but we don’t have 25 or 26 [players].“If we end up with two, three or four injuries, 15 or 16 players, where Rio and Trey are two of these 15 or 16, then need to play almost all the minutes and then things can become complicated.“But this is a decision we have made together, I completely believe in this, because if you have 25 [players] it’s very hard to manage your squad.”The two looming six-day breaks will be a relief to Van Dijk and Szoboszlai, in particular, but Liverpool need to ensure they are being effectively managed so that they do not later face a stint on the sidelines.It is the last thing this season needs.FotMob is an essential app for every fan to keep up to date with their team or follow football worldwide, their incredible features provide all you could ever want and information you never knew you needed! You can download the FotMob App here.