The injury to Jeremy Frimpong exposes the defensive frailty of Liverpool F.C., with no senior right back fit and key players injured or unavailable. The team's lack of senior centre back signings has been a pressing issue for two summer windows, and it seems this issue will happen again. There's no cover for current players, with both right backs being very injury-prone, and Virgil van Dijk's centre-back partner remains unconfirmed. With the experience of Joe Gomez also injured, fans are now crying out for that experienced high quality centre back with European competition experience. Two players with recent links to the club include Fikayo Tomori and Nico Schlotterbeck. Both are Champions League regulars for AC Milan and Borussia Dortmund, respectively; they have been at the highest level for many years, which feels like what Liverpool needs. Tomori can also play right back, with him ranking in the top 5 per centile in touches and tackles amongst fellow Serie A defenders, as well as having a 90.2% successful passing rate (source: FotMob). Following up on a signing of this profile may relieve pressure on the starters in the team and lead to fewer injuries with more rotation options available when the schedule starts to incorporate two games per week. If Frimpong is injured and cannot play the first game against Newcastle, what would Iraola's back four look like? To replace the Dutch right back, the solo option of under-21's right-back Calvin Ramsay would get the nod. A right back who has been solid when starting, Ramsay is not the right back for Liverpool if they are to compete for titles. Van Dijk would lead the defence, and his centre-back partner currently would be Luke Chambers. Chambers scored in the 4-2 defeat on Sunday night, but with a lack of senior experience and Ndukwe unable to play due to visa issues, it seems as if that hole in the defence with no guaranteed return for any other centre-back is turning problematic. The left back would be Milos Kerkez. No issue there; the Hungarian is looking to build on a good end to his first season at Anfield. It seems a lack of senior cover defensively would bring Liverpool short of trophy success. League titles and Champions Leagues are won with good defences over a long season, something that Liverpool need to change before Newcastle away if they are to be serious trophy contenders. Whilst it is not time for panicking Liverpool fans, time is ticking before Newcastle and the team must address their defensive frailty.