For Naby Keita, Liverpool's Champions League tie with RB Leipzig could have offered a chance to show his old club what they are missing.

Travel restrictions put in place amid the coronavirus pandemic have blocked the first leg from taking place in Germany, so Budapest will instead stage the opening match of the last-16 showdown on Tuesday. Keita, however, will not be there.

Rather than head to the Hungarian capital with the rest of the squad, the Guinea international has remained back on Merseyside to continue his recovery from the latest injury setback in a Liverpool career that has flattered to deceive so far. 

There have been bright moments, occasional performances where he has demonstrated his class, but too often those high points have been followed by a prolonged spell on the sidelines.  

Keita made 43 league appearances in his first two years in England, but only 25 of them were starts. This season, there have been just seven outings, the last of them on December 19 in the 7-0 thrashing of Crystal Palace, back when everything looked far rosier in Liverpool's garden.

Jurgen Klopp provided a positive fitness update on the midfielder ahead of the Leipzig game, revealing: "Naby is no longer injured but he's not fit yet".  A reunion with his former employers could still come at Anfield in the return fixture, albeit the German manager is not known for being sentimental when it comes to team selection.

Liverpool were patient in the first place just to get him; having failed to agree terms for his immediate transfer, they instead struck a deal with Leipzig to have him join 12 months later for, at the time, a club-record fee.

"Until I join my new club, next summer, I will remain an interested supporter from a distance," Keita said when the impending transfer was confirmed. Sadly, too often he has been stuck watching on since. There have been hamstring, thigh, groin and knee issues, plus a spell out after contracting COVID-19. It has felt like one step forward, two back.

Still, his two seasons at Leipzig – during which he contributed 14 goals and 12 assists in 58 Bundesliga games – demonstrated why Klopp was willing to wait. Comfortable with the ball at his feet and capable of playing the killer pass when working in crowded spaces, he was seen as the ideal attacking threat that could lift the team to the next level. 

The Reds have duly raised their standards, but Keita has been a peripheral figure. He was ruled out of the Champions League final against Tottenham in July 2019 and, while he played – and scored – the night Liverpool lifted the Premier League trophy just over 12 months later, it was one of only 14 starts in all competitions. 

His only other league goal during that title-winning campaign came at Bournemouth in the previous December, when he picked up possession in a pocket of space in front of the opposition defence, played a clever one-two with Mohamed Salah and then toe-poked the ball in.

Such moments of quality served to underline why he was identified and, eventually, signed. Liverpool have rarely made big-money mistakes in the transfer market, but Keita has yet to live up to the hefty fee, which covered his £48million release clause plus an undisclosed premium that sealed the deal. 

While seven goals and four assists in 45 starts is so far a disappointing return on that sizeable investment, exploring Keita's contributions in greater depth shows what he can produce when healthy.

No player who had over 20 dribble attempts for Liverpool in the 2019-20 league season had a better success rate than his 82.14 per cent, while his figure for big chances created per 90 minutes (0.55) was the best of the lot, too. Add in an average of 10.95 passes into the final third per 90 and you see the type of numbers that suggest he could have made a difference this term, particularly in games where Klopp's side have struggled so badly to break down opposing line-ups stuck in a low block.

There is still time to have a greater impact, of course, but rather than taking centre stage when Liverpool take on Leipzig, Keita is stuck as a spectator once again, a footnote to the storyline as the knockout stages of the competition begin.