NEIL LENNON today revealed Mikael Lustig complained of heart palpitations when he was taken off during Sunday's William Hill Scottish Cup semi-final win over Dundee United.

The Swede defender also aggravated the groin problem which, along with a thigh muscle injury, has been troubling him for several months.

The Celtic manager is now awaiting an update from his medical team to establish what happened to Lustig and how long he might need to be out of action.

Lennon explained: "He was feeling palpitations in his heart, believe it or not. To be fair to Mikael, he played against Hibs 10 days ago, but he did not train at all last week.

"We have really tried to protect him. He came off on Sunday with a groin strain. Again, that's fatigue."

The 26-year-old fears he may have to go under the knife to clear up his groin and thigh problem, and Lennon admitted he does not know if this remains the plan for the end of the season.

The full price of the dramatic victory over United on Sunday is only now beginning to become clear.

Top scorer Gary Hooper also suffered an injury which could prevent him taking part in Sunday's game against Inverness, when the SPL championship can be clinched.

Cautions for Victor Wanyama and Beram Kayal during the weekend extra-time win have ruled them out of the cup final on May 26, and Lennon is about to instruct the Kenyan to start his summer break early.

Lennon now plans to bring in some of the men who have been waiting in the wings this season, including Tom Rogic, Dylan McGeouch, Tony Watt and Paddy McCourt.

Thomas Rogne will also be given game time – when he recovers from his latest injury.

The 22-year-old Norwegian defender is fast approaching the end of his contract.

A new one has been offered, but attempts to hold discussions with his agent have proved impossible.

Lennon revealed: "We have had no feed back again from his agent.

"He's injured at the moment, so hopefully, he can start training again next week and he will play some games."