The Liverpool boss described the midfielder as 'really sharp' on returning to action.
Manchester United's Ander Herrera in action with Liverpool's Adam Lallana
Liverpool boss Jurgen Klopp has been speaking to the club's official website of midfielder's Adam Lallana's impact on the game during Monday night's Premier League clash with Manchester United at Anfield.
In a tepid encounter, both sides ground out a goalless and largely uneventful draw, with little room for manouevre - literally - for either side.
Following Lallana's arrival on the hour mark for Daniel Sturridge, The Reds were able to inject some life into the game, but were still frustrated by Jose Mourinho's defensive setup.
Klopp, however, spoke of the 28 year-old player's half hour cameo as 'really sharp'.
The German boss told LiverpoolFC.com: "He’s a good player, so it was no surprise. But he trained for two days - maybe he could’ve started, I don’t know, he was really close".
Liverpool's Adam Lallana celebrates scoring their first goal
Lallana has been revitalized under Klopp at Liverpool. The former Southampton man has hit the ground running this term, scoring three times in eight games.
He is already just one shy of his total during the whole of last season, finding the net four times.
After sustaining an injury versus Swansea City before the international break, Lallana missed England's games versus Malta and Slovenia.
He made his return last night, allowing Liverpool an attempt to grab a foothold of a tight and stubborn 90 minutes of football.
Lallana was a major doubt for the meeting with fierce rivals United, but was named on the bench to face Mourinho's side.
Liverpool's Adam Lallana made his return on Monday night
The work of the Liverpool medical team however has ensured the midfielder returned quicker than expected, to which Jürgen Klopp was quick to commend his staff.
"Thank you to the medical department, the fitness coaches, because they did a great job," he said. "After two days training, he could’ve played, but no-one knows for how long. When he came in he was really sharp, greedy, after 12 or 13 days, to feel the ball again."
After playing 30 minutes and barring a recurrence of his injury, Adam Lallana is expected to be named in The Reds' starting XI for the visit of West Bromwich Albion on Saturday evening.