Stoke boss Mark Hughes is concerned about the knee injury Bojan Krkic picked up in Stoke's 4-1 FA Cup win over League One Rochdale on Monday night.
Goals from Bojan Krkic, Stephen Ireland, Jon Walters and Victor Moses were enough to help Stoke escape the fate of many other Premier League teams this week and reach the fifth round.
Stoke's star player Bojan opened the scoring but the in-form forward hobbled off with a knee injury soon after. Hughes hopes the Spaniard, who has been a revelation for the Potters this term, is not out for a long time.
"There is a concern there for us," Hughes said. "We don't know how bad it is. He has gone back home and we will check him in the morning.
"He is due for a scan so hopefully he will be OK. Hopefully if the scan is clear he will be okay and it is just a short-term thing but at the moment it's a concern for us."
The 24-year-old, who has now scored five goals since his move from Barcelona, hammered a left-foot-volley past Josh Lillis from 22 yards after Dale had looped the ball clear from their own box. Hughes said he thoroughly enjoyed watching Bojan's effort fly in.
"It was an outstanding goal," the Welshman said. "He showed his qualities once again and it will be disappointing if we lose him for any length of time, but if you do others have to step up to the mark."
Ireland put Stoke 2-0 up just after the break, then Moses scored a stunning curler for the Potters' third and Walters rounded the win off from close range after Rhys Bennett's consolation goal for the hosts.
"Stephen Ireland came in and showed a lot of quality tonight," Hughes said. "He always looked likely to score and he did tonight. If one door closes for one player, another opens."
Hughes said the fear of falling victim to another FA Cup upset inspired his team, after they watched Chelsea, Manchester City and Tottenham all exit the competition over the weekend, while Manchester United were held to a draw at League Two Cambridge.
"I mentioned what happened to the players over the weekend before the match. It would have been foolish not to," the Stoke manager said. "I needed to make sure there was a real focus to us as a group.
"There was a reason why the television cameras were here -- people were hoping for an upset, but we didn't want to be a part of that. We didn't want it to happen."
Hughes is relishing a trip to his former club Blackburn in the fifth round.
"It will be good to go back," said Hughes, who managed the Lancashire club for two years. "I have good memories of my time there and there are lots of people I know still there. We will have a great following and it will be a real cup tie to look forward to."
Rochdale manager Keith Hill could have been celebrating a victory had his team taken their chances in the first half.
Dale cut open the Stoke defence with ease, but Stephen Dawson and Matt Done failed to score.
Hill said: "We tried to attack with intent and press the opposition but they are an excellent side. The game is marginal no matter where you stand in the pyramid. Fair play to Stoke, they were worthy winners in the end.
"The Bojan goal was a great piece of skill but it didn't frighten us. The lads have done the club credit. We were undone by four Premier League quality goals."
Information from Press Association was used in this report.