Llorente is on the books of Swansea City at the moment, while Janssen is currently at Premier League rivals Tottenham Hotspur.
However, the strikers could move to different clubs in the coming hours and could be playing for different teams after transfer deadline day.
The Sun has claimed that West Bromwich Albion want to sign Netherlands international striker Vincent Janssen for a transfer fee of £23 million.
Premier League rivals Stoke City are also claimed to be interested in the 23-year-old former AZ star.
Former Liverpool striker Collymore has taken to Twitter to give his take on the situation, suggesting that Tottenham are doing a good business.
Llorente, 32, scored 15 goals and provided one assist in 28 Premier League starts for Swansea during the 2016-17 campaign.