The two former Spurs men were impressed by the 20-year-old's attacking runs in the first half against Bayer Leverkusen.
Tottenham's Dele Alli in action with Bayer Leverkusen's Kevin Kampl
Harry Redknapp, the club's last manager in the Champions League, and Jermaine Jenas, a player who featured in a similar position as Alli, were full of praise for the 20-year-old - and that was despite the England midfielder missing a big chance in the Champions League draw.
Alli headed wide after a super run and at the end of a smart piece of play in the first half, one of a number of good opportunities the North Londoners had in an even game.
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And as Redknapp and Jenas watched the replay of the chance, both were quick to acknowledge the potential of the Spurs star.
"It was a great run from Dele," Jenas said on BT Sport. "It’s only a matter of time before he becomes really prolific from that position, running late into the box.
"If he keeps doing that in his career he’ll be a 12 or 14-goal-a-year man from midfield," Redknapp added.
Alli is already in or around that level, having scored ten goals in his first season at White Hart Lane following a move from MK Dons.
Tottenham's Dele Alli celebrates scoring their goal against West Brom
It saw the youngster become a central figure in the senior England team and also win the PFA Young Player of the Year award last season.
Though Alli was unable to find the net in Germany, he had scored in his previous two appearances, and it would be no surprise were the Tottenham number 20 to far exceed Redknapp's expectation for how many goals he can contribute in a season.