Celtic will be very busy bringing in new players this summer after a desperate display against Rangers, according to Gabriel Agbonlahor.

Speaking exclusively to Football Insider, the former England striker revealed he was “very impressed” with the Hoops’ start to the game but going down to 10 men and conceding in the same move “killed them”.

McGregor was shown a yellow card for a challenge on Ryan Kent in the 24th minute.

Just two minutes later the 27-year-old fouled Glen Kamara but referee Nick Walsh played advantage and Kemar Roofe opened the scoring as a result.

“Sometimes you can forget as a player when you’re on a yellow,” Agbonlahor told Football Insider correspondent Connor Whitley.

“Maybe you get away with more 10 years ago. But now it’s definitely a second yellow. I’m not sure the first was a yellow card.

Subscribe to Football Insider TV now

“There wasn’t much in at that point of the game. I was very impressed with Celtic’s start, they were on the front foot but Rangers got back into it a little bit. It was 50/50.

“He definitely ruined it with that red card. It was Celtic’s chance to stop Rangers from going undefeated. That will have hurt them more than anything.

“It’s Disappointing. Celtic have got a lot of work to do in the transfer window and they need to get the right manager in.

“The goal and the red card killed them with both in the same move.”

Celtic

Celtic found an equaliser through Odsonne Edouard four minutes after the red card.

However, Alfredo Morelos reinstated his side’s advantage after 33 minutes before second-half goals from Roofe and Jermain Defoe sealed Rangers’ 4-1 win.

In other news, Celtic will “definitely” appoint Eddie Howe as manager on this date.