Celtic manager Brendan Rodgers admits he is unable to put a timeframe on Kasper Schmeichel's absence after the goalkeeper suffered an injury setback on international duty with Denmark. Schmeichel damaged his shoulder making a block in the first half of extra-time as the Danes lost 5-2 away to Portugal on Sunday in the second leg of their Nations League quarter-final to go down 5-3 on aggregate after the 1-0 victory in the home leg last midweek. The 38-year-old required treatment on the field and was in clear discomfort but with all six Danish subs already used, he decided to play on and complete the full 120 minutes. Schmeichel was later spotted wearing a sling at the airport and the former Leicester City stopper now appears set for an extended period on the sidelines. Rodgers said: “Well, we don’t know how long he’ll be out. We’re still waiting to hear on that. He’s obviously got some issues with his shoulder. “I spoke to him the other day and he’s okay. He’s obviously disappointed that they lost their second game, but in the main he’s okay.” Schmeichel also came under scrutiny for his performance in Lisbon from sections of the Danish media with accusations of being overweight but Rodgers backed his keeper to handle tbe criticism. He added: "Well I haven't seen it so I don't know what was said. All I know is that Kasper - and the reason I brought him here, knowing him so well - is because he's still a top class keeper. "If you look at his performance level over the course of the season he's been absolutely brilliant. In the big games, he's made big performances. For me, he still has that hunger and that desire to play. "When criticism comes as a coach, manager or player, sometimes it's not civil. Sometimes it's personal, sadly. But what I know with Kasper is that he's an outstanding goalkeeper and he's been brilliant for this club since he's come in. "He's been an incredible ambassador and performer for his country. I know how proud he is to play for and represent Denmark and how much he wants to win with Denmark. "Sadly as well, you're in there on your own as a goalkeeper in some ways. But I know his character and his mentality and I know how determined he'll be to come back."