The youngster says the pressure of Aberdeen's close attentions has caused the Bhoys to slip up.
Celtic star Patrick Roberts has admitted that the pressure being put on his side by Aberdeen in the Scottish Premiership title race has caused the club to slip up over the last week, as quoted by the Scottish Sun.
Ronny Deila's side were held to a second successive draw at home to Dundee on Wednesday night, whilst Aberdeen won 1-0 at Dundee United.
That means that only four points now separates the two clubs at the top of the table with just 10 matches of the season remaining.
Celtic are still in the driving seat, but Roberts, who joined the club on loan at the end of January, admitted that the Bhoys are now starting to feel the heat.
When asked what was causing the faltering form, the 19-year-old said, as quoted by the Scottish Sun: "I don’t know, maybe it’s the pressure from Aberdeen behind us.
"Maybe we’re not just playing to our potential but we need to get back to playing how we did at the start of the season.
"[The draw] almost feels like a loss but we need to get back together and put in a good performance in Sunday."
Celtic face a Scottish Cup quarter-final against Greenock Morton at the weekend, whilst Aberdeen do not play again until next Tuesday's clash with Partick Thistle.
In Rangers' absence from the top flight, the Bhoys have won the Scottish Premiership title four years in a row, and a team other than the Old Firm rivals has not won a league title in three decades, since Aberdeen's triumph in 1985.