The England international was a high-profile beneficiary of Mourinho’s appointment last November and rediscovered his best form during the early weeks of the former Manchester United manager’s tenure.
Alli has struggled to win the total confidence of his manager, however, and was openly criticised for his attitude towards training during the All Or Nothing fly on the wall documentary which aired last month.
The 24-year-old was hooked at half-time during the opening weekend defeat against Everton last month and has is unlikely to start on Sunday against Newcastle after Spurs recorded a resounding 5-2 win over Southampton in his absence last weekend.
Mourinho has never shied away from taking on high-profile stars throughout his managerial reign and Jenas fears the writing is already on the wall for Alli.
He said: ‘Is there clear conversations between Dele and the manage as to what do you want me to do?
‘Tell me exactly how you want me to perform. Because when you came into the football club and you put your arm around me and you showed me some love and we had all the banter about Dele’s brother and all this and there big smiles on everyone’s faces. I went in and banged in like five goals in seven games.
‘This doesn’t sit right with me the way he’s been treated even if he’s not performing at the level which he should be which is why if I was Dele I’d be looking to move on.’